The SunLike leds are an ambitious project between Seoul Semiconductors and Toshiba, creating extreme high CRI leds without cyan-dip, based on deep purple leds. They fall in the same category as the Nichia Optisolis but were from what I recall announced much earlier. I forgot about them because even if they would hit the market I did not expect them easily available soon.
But to my surprise 2 weeks ago I came across them again on leds.de (Lumitronics). They have them on their house-brand led strips, and the shortest one, with 26 leds, was with 15 euro within my hobby budget. I ordered a strip with 3500K SunLike leds, perhaps not the most interesting CCT but for me the most attractive. I unsoldered a few on the heat block for testing on a good quality non-DTP board (my custom djozz-board) and here are the results.
The SunLike leds are industry-standard 3030 size and footprint leds (like also Optisolis) rated for 150 mA and around 25 lumen output, and minimal 95 CRI. The SunLike cimes in 6500K, 5700K, 5000K, 4000K, 3000K and 2700K. The datasheet can be found here
As you can see in the picture above, with the led lighted at 1 mA, just like the Optisolis, the led seems to have 2 dies, but unlike Optisolis, the dies are next to each other without a gap and they are centered. So optically at least there is some potential using a single led in a (low power) flashlight.
Let’s first see if they live up to their high CRI specifications. The led at 150mA from straight above the led:
And at about 60 degrees:
The spectrum is a bit more wobbly than the Optisolis spectra, but the CRI and R9, R10, R11 are more than promised, and the tint is at both angles close to the BBL. The base led seems around 420nm, just as the cooler Optisolis leds, the warmer Optisolis use a 450nm base led so Seoul took a different decision for the SunLike. Looking very good sofar
The voltage/output test.
The test is done like all my led tests, essentially like described first in my XP-L test: https://budgetlightforum.com/t/-/27500 . One led is tested. The ledboard was a non-DTP but good performing 16mm copper board. I added my Nichia Optisolis and Yuji VTC D50 5730 tests in the chart for comparison, so all the ultrahigh CRI midpower leds tested sofar are in there.
The Sunlike performs clearly better than the Yuji led, but also does not compare bad to the praised Optisolis leds, with similar performance up to 400 mA (which is already well outside the specifications), with almost a half Volt higher voltage. Above 500 mA the Optisolis keeps performing better while this SunLike led tops off. The SunLike led died between 950 and 1000 mA.
Conclusion: the SunLike led seems a very well performing extreme high CRI led that has a colour performance very similar to the Nichia Optisolis but it does not match the Optisolis in toughness. But it comes close enough to be an interesting alternative, especially for the 5700K colour temperature that the Optisolis led does not come in. I have no idea about the price per led, but that also could make them more attractive than the Optisolis leds.