Sunlike - the new generation of LED light

Modern white LEDs used for lighting work on the same principle - the LED shines with blue light, and the phosphor with which it is coated converts light into white, adding a red and yellow component to it. The disadvantage of this design is the unevenness of the spectrum, the blue peak (because of it, some scientists even put forward a theory about the insecurity of LED lighting), and the “failure” in blue and green.

Seoul Semiconductor developed Sunlike technology, which uses violet-colored LEDs coated with a three-component phosphor that converts violet light into full-spectrum with full red, green and blue.




The technology for a reason is called Sunlike (in translation - "like the sun"). The light spectrum of such LEDs is really similar to the spectrum of sunlight, and the color rendering index is about 97. In fact, the light quality of such LEDs is not inferior to the quality of light from incandescent lamps.

The Seoul Semiconductor website states that low-power Sunlike 0.2W modules with color temperatures of 2700K, 3000K, 4000K, 5000K and 6500K are already available, while powerful modules with a color temperature of 3000K are still under development.



In fact, these same modules, but with a color temperature of 4000K and 5000K, are already supplied in small quantities to individual customers, but they are still very expensive - 6 euros for a 6-watt, 13 euros for a 10-watt, 19 euros for a 15-watt and 23 euro for a 25 watt.

An enthusiast from Belarus, who calls himself GrowByLEDs, managed to get 25-watt modules and make experimental lamps on them, which I tested.



A round COB module with a diameter of 15 mm is placed on a square aluminum substrate 19x19 mm.



To get more accurate results of the color rendering index, color temperature and spectrum, I measured the light of the lamps with the caps removed. The Uprtek MK350D spectrometer showed the following results.



The spectrum is indeed more even than conventional LED lamps. The color rendering index is about 97.
I compared the spectra of the Sunlike 4000K, a conventional 4000K LED lamp, a fluorescent lamp, a halogen lamp and the sun.



In the experimental lamps that I tested, Sunlike 25 W modules are used at reduced power - finished lamps consume 11.7 W. In this case, a lamp with a 4000K module gives 960 lm, a lamp with a 5000K module - 1000 lm. With caps removed, the lamps give 1133 lm and 1180 lm, respectively.

It turns out that the efficiency of Sunlike modules in this mode is 97-101 lm / W, which is not inferior to conventional modern LEDs and this is very cool.

Belarusian lamps on Sunlike modules can be bought now (from $ 20 for a 6-watt to $ 50 for an 18-watt). I do not publish links here, but they will be in a copy of this article on lamptest.

Seoul Semiconductor is not the only company to launch a new generation of LEDs. The Chinese Yuji LED has also begun to produce modules with violet LEDs and an RGB phosphor that give light with CRI 97, but judging by the information on their website, the violet peak in the spectrum is much larger and the efficiency of the modules is less - 65-85 lm / W.





LED lighting is already used everywhere and can not but rejoice that new technologies are appearing to make this light better.

The new technology is just emerging and the lamps with Sunlike modules are still expensive, but it is very likely that in 2-3 years a significant part of the lighting LEDs will be produced using the new technology and lamps with Sunlike modules or similar will cost as cheaply as ordinary LED lamps now.

© 2018, Alexey Nadezhin