Smd 5730 connection to 12. LED lighting workshop in Dnepr. Turning on COB diodes

LEDs of the smd 5730 series are one of the most popular light sources in their category. This is due to the optimal combination of basic technical characteristics: dimensions, luminous flux and electrical power.

Dimensions and parameters

SMD 5730 are the brightest LEDs, which explains their popularity among other LED light sources.

The main technical characteristics of SMD led 5730 are given in the table below:

For your information! The light temperature is given in the entire range of white light types: warm (3000–4000K), neutral (4300–4800K), pure white (5000–5800K) and cool (6000–7500K).

Expert opinion

Alexey Bartosh

Important! The soldering temperature is the maximum permissible and sufficient when performing installation work lasting no more than 2-3 seconds.

Half to Watt

Recently, new modifications of the LEDs of the series in question have appeared on the lighting products market.

Their differences from standard models are such features as greater electrical power and increased luminous flux.

Important! Models with a power of 1.0 W are marked as 5730-1 and are equipped with two crystals. The luminous flux in such devices can be 158 Lumens.

Where are they used?

Due to its technical features, which provide high brightness at low electrical power, SMD led 5730 are widely used in the manufacture of various lighting devices, namely:

• light sources (lamps) used for artificial lighting in premises for various purposes;
• automobile lamps of various types of use (exterior lighting, light indication, backlight);
• outdoor lighting fixtures;
• LED strips used as artificial lighting, illumination and decoration both indoors and outdoors.

LED strips 5730

Thanks to the bright glow characteristic of SMD 5730, LED strips made using them are successfully used as the main source of artificial lighting in various types of premises (administrative, public, residential).

The power of the smd 5730 LED strip depends on the number of LEDs placed on one linear meter of the product. This is expressed in the values ​​given in the table below:

The number of LEDs placed on one meter of LED strip is displayed on its marking.

As a rule, LED strips are sold in measured lengths, which is 5 meters.

Expert opinion

Alexey Bartosh

Specialist in repair and maintenance of electrical equipment and industrial electronics.

For your information! If it is necessary to cut the LED strip in accordance with the conditions of installation work, it can be cut. To do this, there are cutting lines on the outer surface that divide the tape into segments. There are soldering points on the cutting line through which the product is connected to the power supply.

Depending on the type of coating, LED strips come in different degrees of protection (IP code), which are regulated by GOST 14254-2015 (IEC 60529:2013) “Degrees of protection provided by shells (IP code).”

Products with the highest degree of protection IP65 – IP68 can be used in damp and damp areas, as well as directly in water to illuminate aquariums and swimming pools.

The operating voltage for such artificial lighting sources is of two types: 12 and 24 Volts DC. To control their operation, special devices are used that allow you to regulate the intensity of the light flux - dimmers.

Due to the fairly high electrical power, SMD 5730 series tapes generate a significant amount of heat during use. Because of this, the installation of such products must be carried out using an aluminum profile, which allows for heat dissipation and thereby extends the life of the LEDs.

Based on the LED strip of the SMD 5730 series, modules of various shapes and sizes are manufactured, used in the manufacture of lamps of various sizes and configurations.

LED strips of the SMD 5730 series are an individual style in home interior design and high-quality indicators of artificial lighting.

📋 Take the test and make the right choice

LEDs in this series have been produced for a long time, many more modern models have appeared, the demand for them is not decreasing, design solutions in SMD LED technology are constantly being improved. Diodes have high power and are successfully used for the production of light strips and lamps.

Modern, brighter crystals are installed in the old format case; the price of these products is considerable, but this is compensated by a long-term service life and economical power consumption.

The design is adapted for automatic soldering in factory conditions for the production of lighting equipment, but this does not exclude the possibility of soldering diodes manually. Model SMD 5730 is designed for surface, open mounting in LED lighting devices. To ensure stability of parameters during operation, the LEDs are connected via a driver.

Under ideal conditions, at an ambient temperature of 18–22 °C, the LED is capable of emitting a luminous flux of 110 lm with a power consumption of 1.1 W. The current reaches 350 mA at a voltage of 3.1–3.3 V, in pulsed mode the figures are even higher - the current is 800 mA, and the properties of the crystal do not deteriorate.

Ambient temperature has a great influence on technical characteristics; it affects the amount of current and luminous flux emitted by the diodes. The higher the temperature of the crystal, the lower the luminous flux. Therefore, lamps must have a good heat sink for heat dissipation.

Manufacturers often save on installing full-fledged radiators in the design of lighting fixtures, reducing the price at the expense of quality. The radiator is made based on the maximum permissible operating temperature of 65 °C. From the diagrams below showing the dependence of parameters on temperature, it is clearly seen that the luminous flux can be significantly increased when the temperature decreases.

To prevent the LED crystals from being destroyed, the forward current is set at 170 mA, which significantly reduces its real capabilities for creating a powerful luminous flux. The graphs show that the maximum luminous flux can be achieved at a current of 350 mA, but this will require a good heatsink or sub-zero ambient temperature. Climatic conditions do not depend on manufacturers, and it is not possible to construct such a radiator in a compact form on a lighting device.

Based on color temperature, SMD 5730 LEDs are divided into four intervals across the entire emission spectrum:

• warm – from 3,000 to 4,000 K (yellowish spectrum);
• neutral – from 4,300 to 4,800 K;
• pure – from 5,000 to 5,800 K (white light);
• cold – from 6,000 to 7,500 K (bluish tint).

Design features

The designation itself contains design indicators - SMD and 5730, the first abbreviation translated from English means that the device is intended for surface mounting. 57 and 30 are overall dimensions in millimeters. Crystals of various materials are used to emit light:

• indium (In);
• gallium (Ga);
• nitrogen (N).

The spectrum of emitted light depends on this: yellow, white or bluish. The body is a lens made of heat-resistant plastic, fixed to a substrate with epoxy resin.

The SMD 5730 package design is considered similar to the previous 5630 model, but the new diodes have two options:

• SMD 5730-05– Power consumption ½ W, maximum permissible current 180 mA, while all power is spent on luminous flux with almost no losses. In pulsed mode, the current amplitude reaches 400 mA, creating a luminous flux power of 45 lm.

• SMD 5730-1– have the best performance: maximum operating current 350 A, in pulse mode up to 800 A at a voltage of 3.2 V, a luminous flux of 110 lm is provided, power consumption is 1.1 W. The p-n junction built into the crystal can withstand temperatures up to 130 °C, the operating temperature range is from -40 to +65 °C. Compared to SMD 5050 diodes, SMD 5730 provides 6 times more luminous flux.

There are already more modern models with a crystal that provides better performance - 158 lumens/W.

At the bottom of the case there is a substrate made of heat-sinking material; the production technology is such that it is soldered to the + and – contacts (cathode and anode) simultaneously. On the cathode side, to visually determine the polarities, a cut (key) is made at the corner of the housing.

Diode soldering requirements

It is recommended to solder the diodes with low-melting solder JEDEC J-STD-020C, this is due to the fact that the maximum temperature that the crystal can withstand for a short time is 300 °C. In this case, a number of requirements must be met:

• the temperature of the soldering iron tip should not be more than 300 °C;
• the duration of contact of the tip with the diode contacts is no more than 2–3 seconds;
• the case is soldered into the lighting fixture once, the crystal may not withstand repeated soldering;
• do not move or turn the board over until the tin on the contacts has cooled;
• Do not press hard on the LED body, especially when heating it with a soldering iron.

When purchasing lighting fixtures or individual SMD 5730 LEDs, looking at the datasheet, you need to pay special attention to the manufacturer. SMD 5730 successfully combined small dimensions and powerful luminous flux in its design, so now many manufacturers place low-quality crystals in the SMD 5730 package; Using the datasheet, you will see the characteristics from the manufacturer Samsung. It is almost impossible to determine the differences by appearance. It is necessary to measure parameters to ensure compliance with the declared characteristics. Therefore, be careful and purchase products in shopping centers licensed from manufacturers LG, Philips, Samsung, and other Western companies. Diodes from Chinese manufacturers provide 4–5 times less illumination than branded products.

LEDs SMD 5630 and SMD 5730 have become very popular in home lamps due to their good technical characteristics. They make it possible to produce inexpensive and small lamps, analogues of 40W, 60W, 90W lamps. But even here there are many subtleties in the specifications, and finding them is not very easy.

• 1. Real power of Chinese LEDs
• 2. Characteristics and differences between 5630 and 5730
• 3. Comparison of corn lamps on 5630 and 5730
• 4. Calculate the real power
• 5. Results

Real power of Chinese LEDs

90% of Chinese products, for example on the Aliexpress bazaar, are made with low-power diodes, which are much weaker than branded ones. Branded ones are produced by Samsung, LG, Philips and others. The Chinese actively use this, specifying parameters as if Samsung were installed there. After the purchase, it turns out that the brightness and power are 3-4 times lower than what the seller promised.

It turns out that the Chinese 5630 (5730) is 0.15W weaker than the branded 5050 by 0.2W. Be careful when choosing a product.

Characteristics and differences between 5630 and 5730

The table shows the parameters and differences for branded and full-fledged branded ones.

When overheated, the LED begins to lose brightness and burn out. Do not allow it to overheat, otherwise it will become unusable in a short time, having exhausted its service life.

Comparison of corn lamps on 5630 and 5730

SMD 5630 lamp, 42 pieces

At the beginning of my close acquaintance with LEDs, I bought lamps in a Chinese store that contained 42 light elements and were similar to 60 W incandescent ones. The light bulbs turned out to be very good and bright for that time. A power source was installed inside on a ballast capacitor, everything was as simple as three rubles. Thanks to their simple design, they can be easily repaired in just 5 minutes.

Soon the SMD 5630 LEDs were improved, and 5730 appeared. For the sake of sport, I bought 5 corn for 60 pieces of SMD 5730, an analogue of 90 Watt, in an online store. As a result of short tests, the main differences were revealed.

Calculate real power

Since the light bulbs were purchased in China and at a minimum price of 160 rubles, naturally the manufacturer is unknown. Using low-quality LEDs, the Chinese underestimate their power in order to protect them from burnout and short service life. With the rated power of the SMD 5630 being 0.5 Watt, in my case we get 0.15 Watt per unit. This was confirmed by the Chinese themselves when I spoke with them. This rule also applies to Chinese ones; do not believe what the seller promises you in the characteristics.

Remember a simple formula, do not believe what the seller promises you. Multiply the number of LEDs by 0.15 and you will find out the real one. Valid for 5630 and 5730 only.

Testing was carried out in the kitchen and hallway. The color temperature is the same, white daylight. An LED light bulb with 60 elements 5730 shines 1.5 times brighter than with 42 LEDs 5630. This is due to the fact that the number of diodes is one and a half times greater.

If you have a corn lamp, first turn off the power to the chandelier. Such a lamp has open contacts, although the voltage on it is low, about 20-30 Volts, but you will not get anything pleasant. Follow safety precautions.

Results

LEDs SMD 5630 and 5730 have now become the most popular due to the optimal combination of power and luminous flux. Powerful and diode strips are produced on their basis. But always pay attention to the brightness of one diode, I would overpay 30%, but would gain 100% in quality and service life.

Reviews and questions, 66 comments

1. Vladimir 22.01.2019

   Well done, you are not friends with Chinese lamps, I have discovered almost everything about them!!!

   1. Expert answer 28.01.2019

      I haven’t been friends with them for a long time, and I recommend them to others.

2. Denis 06.12.2018

   There is an LED matrix consisting of 70 SMD 5730 LEDs that are soldered in series (that is, one after another). On this board there are only LEDs and nothing more. The question is what driver do they need or how can they be powered from 220 volts?

   1. Expert answer 15.12.2018

      It all depends on the connection diagram. In addition, the LED current is unknown.

3. Alexander 17.01.2017

   Hello, I want to convert a 10 W LED spotlight from 220 to 12 V. The LEDs cost 5730. Judging by the measurements, each is supplied with a voltage of 3.2 V. By connecting 4 of them in series we get 12.8 V. And the voltage that will be supplied is 12 V through the KR142EN8B stabilizer, since in the automotive network the voltage varies from 11.8-14.2. Question: will this circuit of 4 LEDs have enough voltage so that the light output is not lost and will the stabilizer close if the input voltage is less than 12 V???

   1. Expert answer 23.01.2017

      Install a step-up voltage converter that converts 12 volts to 60 volts. Read the “Nutrition” section on my website.

4. Alexander 28.12.2016

   How can you avoid overheating such a light bulb?
   how to find out its resource by the time of constant use for an hour a day or three continuous work
   Should I install a temperature sensor on the lamp?

   1. Expert answer 30.12.2016

      I don't understand what you want to do.

5. ! 07.11.2016

   Do you need to buy branded LEDs, and of course from you, and not Chinese ones that are half the price? Without a doubt. I purchased 5730 on Ali several times and all the characteristics are the same! even luminous flux. Yes, but practically for nothing. But someone can also buy “branded” Philips Samsung phones, etc. at three prices. But the materials for the production of LEDs are mined in China. 95% of the world's reserves of rare earth elements are in China and since the 14th year the country has banned the export of these elements. So... hello fellow marketers.
   P.S.
   I think you understand now why Philips Samsung prices are high? And I’ll tell you a secret, everything is produced on the same lines. Both in China and on Philips Samsung. but there is one nuance) Chinese manufacturers have virtually no control over the output products due to mass production and defects can slip into wholesale quantities. But in general, Philips Samsung and Chinese products are absolutely identical.

   1. Expert answer 07.11.2016

      Samsung, LG and Philips can operate at temperatures up to 110-130 degrees and their service life is 5 times higher. Cheap Chinese ones work up to 60 degrees. Average Chinese ones are up to 80. How did you measure the luminous flux? How did you check the service life?

6. Kotofey 06.10.2016

   Hello. Is it possible to check the volts and amperes on an LED kit with a simple voltammeter for 300 rubles? And if it is possible, how to do it? Then you need to calculate the power consumption of each LED separately and thereby find out the real luminosity of this set? But is this somehow possible in the store?

   1. Expert answer 06.10.2016

      You can use a multimeter, google it.

7. Nick 01.03.2016

   The Chinese are now selling 5730 4st, if you compare purely by description, then in comparison it turns out that their luminous flux is one and a half times less, and it turns out that with the same number of diodes, these 4st are a little more expensive. Can we expect them to last longer?

   1. Expert answer 01.03.2016

      What has changed? Design? The same Chinese junk with the worst LEDs. The parameters are overestimated by 2-3 times. Read the article on my website why you shouldn’t buy on Aliexpress.

8. Alexander 17.02.2016

   Sergey, good afternoon! I would like to know who in Russia produces good quality LED optics for cars and special equipment (snowmobiles, ATVs). And how to determine how a 3W or 5W or 10W diode shines. Thanks in advance.

   1. Expert answer 17.02.2016

      It depends what you mean by “car optics”. For ATVs and snowmobiles, they are mostly made by the Chinese, but in Russia they only change the name. I haven’t done much with additional work lights and LED beams, so I only have 2 large scooters. I am still planning to buy an ATV. The luminous flux of an LED can only be determined by calculating the electrical power. Or measure the luminous flux of an LED in an expensive device, such as a light sphere. I have a 60 by 60 cm box with reflective walls and calibrated for large products. A lux meter is attached to the box.

9. Edward 17.02.2016

   Hello. I made a 10 W light bulb myself, 5730 LEDs, bought on Ali at a ridiculous price. I put them on corner aluminum radiators; during operation they heat up to 65 degrees with natural cooling. How long do you think they will live?

   1. Expert answer 17.02.2016

      I know more than 100 models of 5730 LEDs, which ones did you buy? what marking, manufacturer. Or do you have a Chinese noname that will quickly die?

10. IURII 29.01.2016

    Well, don’t know that chips come in different sizes and each requires its own current. What you don’t have to measure, it’s enough to make a comparison with test ones of real size. About the voltage drop depending on the current and so determine the increase. It’s good that not only ordinary people, but also those who understand, look into the comments. Looked here for the first time. I looked at what people were asking. Well, your answers are simply bestsellers - it’s just a mockery. It’s better not to answer at all, as Alex noted

    1. Expert answer 29.01.2016

       I know everything about the sizes and about the current, the time will come everything will be written on the website. I can’t answer you in two sentences, you still won’t understand and there will be 5 more additional questions. Such issues are resolved on forums. I have dozens of serious questions a day, read books about LEDs and lighting technology, everything is described there.

11. IURII 29.01.2016

    Sergey! I understand that you have taken on tests and measurements and weighing of goods. Then gather your thoughts and write about it. And to answer questions in the comments, it would be better to call someone else with a less busy brain

    1. Expert answer 29.01.2016

       But I can’t find an assistant, I have to do everything myself. I have 6,000 people a day on the site, and a lot of questions from them.

12. Alex 29.01.2016

    If you don’t know the answer, it’s better not to say anything at all, because what you advised is, from a technical point of view, nonsense!
    You can find out the optimal diode current by applying voltage to it through a variable resistance, gradually decreasing the resistance, you need to monitor the ratio of the change in current and voltage, at the moment when the voltage increases to a lesser extent than the current - at this moment the optimal LED current will be achieved, a further increase in current will not lead to an increase in brightness, this is also a guideline.

    1. Expert answer 29.01.2016

       I know it’s nonsense 🙂 you don’t understand the humor 🙂 It’s impossible to determine which crystal is worth and what current it needs.

13. IURII 29.01.2016

    What device is used to measure power and what does it mean? I know about the power consumed by the LED. Which one are you talking about? I'm buying LEDs and want to know if I was scammed or not. How do I understand that it is possible to supply a certain current or even for these lights you need less. Because of this, one light can have 150mA, while another, like the same one, has a lot of 50mA. Just don’t write about different quality. Please answer correctly if you can, otherwise how many people I asked around gave the same evasive answer. I want to understand and understand further myself. Thank you

    1. Expert answer 29.01.2016

       It is impossible to determine which crystal is in the LED and what current it needs.

14. IURII 29.01.2016

    How about giving an answer from a specialist position? And then almost all of your answers are of this kind

    1. Expert answer 29.01.2016

       Measure the power of the LED, then you can find out the current strength.

15. IURII 29.01.2016

    Write that there are correct and not so correct LEDs. How to determine what current to apply to a particular LED so that it works and does not burn out. How do you understand that this one can be freely given 150 mA and the other only 50 mA or even less??

    1. Expert answer 29.01.2016

       Buy good branded diodes and you will know what current can be supplied.

16. Artem 19.01.2016

    Do you know the LED manufacturer Honglitronic? I found quite a large selection of these LEDs. Is it worth taking?

    1. Expert answer 19.01.2016

       Known. Decide for yourself about the purchase. There is a lot of deception in the LED business, because you cannot immediately check the parameters with a device.

17. Artem 17.01.2016

    Question about the resistor for the Chinese SMD 5730, by the way, the characteristics indicate epistar, can their LEDs be sold on Ali? Seller on Ali: It is indicated that the current is 150 mA, I doubt it... Based on your experience, what kind of current do you think will not burn out such an LED? And how to choose a resistor for connecting to 12 V (car network 12-14V...)?

    1. Expert answer 18.01.2016

       Epistar makes some decent LEDs and some of the worst. What they are like here is not known at all.

18. Timofey 16.01.2016

    Can't overclock...
    On the second switch-on, the “Chinese” gave orders to live long!!!))))))))))))))))

    1. Expert answer 16.01.2016

       They can’t stand it, the branded ones can stand it.

19. Artem 16.01.2016

    What resistor should I use to power one Chinese SMD 5730 when connected to a 12 V source?

    1. Expert answer 16.01.2016

       It depends on how powerful it is.

20. Timofey 03.12.2015

    And yet, how to overclock? Lower ceramic resistance or both (ceramics, electrolyte)?

    1. Expert answer 03.12.2015

       Increase the current on the LEDs, reduce the resistor value.

21. Alexander 03.12.2015

    Will a large cable cross-section help so that the 5v current reaches the LEDs and they shine fully, or is there any other solution? one element produces 50-70 lumens 1 LED, 1 piece contains 3 diodes 3 multiply by 12 36 multiply by 70 we get 2520 lumens

    1. Expert answer 03.12.2015

       Where does it give 50-70 Lumens? If, according to the passport, a branded LED at 0.5W is a maximum of 40 Lm, and a Chinese diode at 0.15 W is only 12 Lm.

22. Alexander 02.12.2015

    Hello, LEDs were purchased, modules of them were assembled from 12 boards, placed on heatsinks from processors with thermal paste, the photo turned out to be quite powerful, the spotlight produces almost 2500 lumens, the whole thing is powered by a 5V computer power supply, the question is whether it is possible to use a power supply computer? This turns out to be 36 LEDs per spotlight and there are 4 spotlights. the result was almost 10,000 lumens

    1. Expert answer 03.12.2015

       How did you determine the brightness of 2500 Lumens? Even if they are branded at 0.5W, it will only be 1440 Lumens.
       If Chinese budget ones are 0.15W, then 500 lm.
       Measure current and calculate power.
       You can use a computer block. It's bad that you are powered by 5 volts, this line is usually weak.
       It’s better, of course, from 12V, but you have 5V LED modules. In my mind I should have bought others.
       The power supply from the computer has the power written on it, and you can use it to see whether it can handle it all or not.

23. Timofey 26.11.2015

    Is it possible to increase the diode power to optimal in “garage conditions”?
    “...With the rated power of SMD 5630 being 0.5 Watt, in my case we get 0.15 Watt per one...”

    1. Expert answer 26.11.2015

       This is a Chinese LED with a nominal rating of 0.15W. It is bad and will die much faster during acceleration.

24. Adex 17.11.2015

    “I am a master of disputes on Aliexpress. Measure the power consumption with a wattmeter. You multiply the power by the efficiency of 70-80 Lumens per watt. You get brightness. Here is the proof."
    Are you aware that the light output of diodes of the same type, but from different manufacturers, can vary greatly?

    1. Expert answer 17.11.2015

       It is very good that you are aware of the different light output of diodes. 80 lm/W for the most common ones.

25. Alexander 05.11.2015

    I didn’t ask the total power, I’ll calculate it anyway, I asked about the heat sink and temperature, is there any data on how much area is needed for the radiator at different heating temperatures????

    1. Expert answer 05.11.2015

       Your sentence with a question mark: “Do I need a heat sink (in the form of a track under the LED)????”
       I told you that I need it in any case.
       You understand, knowing the full power, according to the specifications of the LED, you will calculate the required heat dissipation, based on the thermal design parameters.

26. Alexander 05.11.2015

    Hello. I want to assemble a light lamp with 24 LEDs, circuit 6 last, 4 pairs in parallel, using a 12-25 V 300 mA driver. The proposed current in the 6th sequence = 300\4 = 75 mA (at 3.3Vx6 pcs.) with this how hot the LEDs will be. Is a heat sink necessary (in the form of a rail under the LED)????

    1. Expert answer 05.11.2015

       Heat removal is necessary in any case. Calculate the total power by voltage and current.

27. Alexander 04.11.2015

    I bought some corn on ebay, it was full of shit. Out of 10 pieces, 9 failed within a year. Before dying, the lamp blinks disgustingly. 1 LED always burns out, after which it can probably be replaced, but when disassembling such a lamp, the soldering falls off (sometimes along with the tracks). After this, you give up and don’t want to resuscitate her. Burn them in; they haven’t come up with anything better than incandescent light bulbs yet.

    1. Expert answer 04.11.2015

       You wouldn't buy such garbage from the Chinese. I have written a good article about Chinese wretched corn.

28. Vladimir 28.08.2015

    Good afternoon, Sergey!
    I bought a board of LEDs with a built-in driver for 220V, P = 5W, 10 pcs on the board, upon measurement it turned out that the operating voltage on 1 LED was 17-18V and the current was 25mA.
    in form very good similar to 5630, 5730.
    I have never seen anything like it. Tell me, if possible, what kind of LEDs they are. Thanks in advance!

    1. Expert answer 29.08.2015

       I haven’t seen any of these, there are many rare diodes of different shapes and power. Judging by the current, they are really 0.45 watts.

29. Anonymous 05.08.2015

    Hello, Sergey! The Chinese are simply mocking: through Ali they sold a 48 SMD CREE 5730 corn lamp as a 12-watt lamp, but in fact it shines like a 6-7-watt lamp, and at the same time they mock: you have to prove it! Well, you hit a nerve! It’s a cheap question, but it has already become a matter of principle. Tell me, what arguments need to be given to prove them wrong?

    1. Expert answer 05.08.2015

       I am a master of disputes on Aliexpress. Measure the power consumption with a wattmeter. You multiply the power by the efficiency of 70-80 Lumens per watt. You get brightness. Here's the proof. You add video measurements to a dispute. Write your email, only I will see it.

30. Oleg 28.04.2015

    Can they have the same power supply pins, or, as in the picture (with dimensions), are they different?
    And thanks for the article.

    1. Expert answer 29.04.2015

       Power outputs depend on the manufacturer and will be different everywhere.

31. Michael 06.04.2015

    Interesting article. Thank you!
    But what about Wikipedia data?
    5730 is stronger than 5630...?
    5730, 5.7 x 3.0 mm, 0.5 w, 47-56 lumen, lm/w 112
    5630, 5.6 x 3.0 mm, 0.5 w, 57 lumen, lm/w 114

    1. Expert answer 06.04.2015

       I trust datasheets more than Wikipedia, since the manufacturers are different, so the quality and characteristics are different.

32. Hermann 12.03.2015

    I just went to the site to understand the 5050 and 5730 LEDs.
    two pages, two tables, but the numbers in them are different
    diode 5050 Luminous flux 15lm or 18lm
    although further in the text 80lm/watt 1watt/0.2watt=5pcs 80/5=16lm from one SDM 5050
    Thank you

    1. Expert answer 12.03.2015

       The difference in numbers is within normal limits, because the brightness depends on the temperature of the light, it is higher for cold light and lower for neutral white, worse for warm.
       The brightness also depends on the manufacturer. When writing this article, I use average indicators; anyway, calculations with lumen accuracy cannot be made.

33. Alexey 02.03.2015

    “and the diode efficiency itself is almost 50% higher”
    37.5% is more like “a third more”

    1. Expert answer 02.03.2015

       Here the word “almost” plays an important role; the 37.5% you indicated is within the limits of this tolerance.

SMD 5730 and 5630 LEDs are among the most popular currently. They are ultra-bright medium-power diodes and have a good combination of size, power and luminous flux. Thanks to the development of technology, in 2015 other modifications began to be produced in the standard SMD 5730 package, which differ greatly in parameters and characteristics from the most common model. In appearance, they are practically indistinguishable, except for a specialist. Such LEDs are produced only by well-known manufacturers, and are rare, only in expensive LED equipment due to their rather high price. You won't find them in a regular Chinese-made lamp.

• Models with two crystals are marked as 5730-1, the rated power is 1 Watt.
• Models with an improved crystal providing up to 158 Lumens per Watt.

The most powerful are considered. Do not forget that you will need a radiator for cooling, which can be an aluminum profile.

• 1. Real power of Chinese LEDs
• 2. Main characteristics of SMD 5730
• 3. Detailed technical characteristics of SMD 5730

Real power of Chinese LEDs

90% of Chinese products, for example on the Aliexpress bazaar, are made with low-power diodes, which are much weaker than branded ones. Branded ones are produced by Samsung, LG, Philips and others. The Chinese actively use this, specifying parameters as if Samsung were installed there. After the purchase, it turns out that the brightness and power are 3-4 times lower than what the seller promised.

It turns out that the Chinese 5630 (5730) is 0.15W weaker than the branded 5050 by 0.2W. Be careful when choosing a product.

Main characteristics of SMD 5730

Compared to SMD 5730, and considered obsolete, they require several times more. Often in describing the parameters (datasheet) of LEDs, I use branded LEDs from Philips, Samsung, Osram. To compile these characteristics, the parameters of branded Chinese production Honglitronic are used, which are not inferior in parameters to European brands.

If you are going to buy diodes, you should be careful. The Chinese produce diodes with a power of 0.15-0.2 Watts in such a package, giving 80 Lumens per Watt. Visually, they are no different from 0.5 W LEDs. If you are lured by a low price, then they may well turn out to be fake. Even after the purchase, it is difficult to prove the fact of fraud, especially if you buy in China, for example on Aliexpress. Making a return will also be expensive and time-consuming, especially since they will happily pretend that they lost the parcel.

Detailed technical characteristics of SMD 5730

I have collected a few Chinese smd5730 lights, I decided to tell you a little about them. In total I have 4 different LEDs. The first ones are quite good, Chinese LEDs, they have already been reviewed. - the cheapest 5730 on aliexpress. I bought them for $1.15 per kilogram, 200 pieces. The third and fourth ones are from the most ordinary meter LED line on an aluminum substrate, purchased offline for $2, cold and warm color temperatures.

To make it easier to compare them, I cut the same aluminum ruler into minimally divisible pieces, 3 diodes each. I left two with the original diodes, and soldered the remaining two to those purchased on Ali. Unfortunately, I don't have a hairdryer yet. Soldering LEDs with a soldering iron is somehow not very good - most often it melts or breaks. I did it the simple way - I heated the iron and placed the pieces of the ruler on the work surface of the iron. Before this, of course, I coated the diodes with flux. I use Polish flux bought at a radio store:

pasta do lutowania

And now the power is supplied with the same current of 50mA:


As you can see, the result is the same.
If someone thinks that with a lower current the rulers shine brighter, I’ll say right away that they don’t shine brighter, but the difference is due to the shutter speed of the camera.

1. “Real smd led 5730”, a review of which I gave a link at the beginning.
2. Warm LEDs from a line purchased offline
3. The same, only cold
4. The cheapest diodes from Aliexpress

I also decided to measure the current and voltage drop at 150 mA of each diode separately. I chose the average voltage - 3.2V. I didn’t take any photos, I’ll just write:

current at 3.2V/voltage at 150mA
1. 151.1mA/3.2V
2. 84 mA/3.65V
3. 81.2mA/3.55V
4. 49.8mA/4.26v

As you can see, the difference is big. Diode crystals are also different:

Results:
The first LEDs are the highest quality, their crystal is really 0.5W. Its size is 15x30mil. Previously, this seller had diodes with an even larger crystal - 20x40 mil, but its power was the same. Probably the crystal manufacturing technology has improved.
The seller promises 50-50Lm at 3.0-3.2V and 150mA. There are also diodes available with temperatures of 3000-3500K, 5000-5500K and 6000-6500K.
The second and third ones are of average quality, the power is about 0.25W. I can't say anything more about them.
The latter are the cheapest and, accordingly, the worst. Power less than 0.2W. The crystal is small, I think from 2838. In the description, the seller does not indicate either the manufacturer of the crystal or its parameters. Only that it is smd5730.