SunLike 3500K 95+ CRI midpower led from Seoul Semiconductors tested

Should be ready for purchase this year:
http://www.nichia.co.jp/en/product/led_sp_optisolis.html

[Clemence]

Thanks for confirming that it is still in the pipeline Clemence :slight_smile:

ССТ 5000 is not good enough. Can’t underatand why every led company starting to produce new kind of leds from low CCT:(

Available in 2700K, 3000K, 3500K, 4000K, 5000K, and 6500K. Nichia usually use 3000K and 5000K for sampling/presentation purposes.

[Clemence]

Probably because there is a norm (IS0 3664:2009) in the graphic & art industry. “The standard dictates that when viewing prints, a light source that replicates the D50 light source should be used”.

Clemence will they be compatible with your boards? With your 36 emitter board, we can get like 20k ultra hi cri lumens? :heart_eyes:

My board? What for? With any COBs you can just plug and solder the lead. The idea of COB is you don’t need any MCPCB to mount the LED. Those tiny LEDs already internally pre-wired, soldered ready to use.

[Clemence]

oh didnt realize they are cob

Many printings used Philips Master TL-D 90 Graphica 965 before led took the market. Do not know much about the norms,but D65 is also a standart I guess.

I used to own that light, it was my EDC for quite a few years. These days I use a Zebralight SC64c LE.

If someone need, I just finalized draw pcb for 3030 sunlike leds

it is for 1-12pcs (12.5x99mm with 2.5mm holes) and 1-6pcs 3030 leds (22x22mm with 3mm hole)
3S4P or 2S4P or 8P
and
2S3P or 3P

Also you can cut it if you need

I would love to upgrade the 5 meters of LED strip above my desk to high CRI. I only paid $2.42 for this 5 meter strip.
But I calculate 5 meters of your SunLike LED strip would cost $392.70. Did I calculate that correctly? Is that price assembled?

My pcb for 12pcs 3030 cost 0.5$ (50%G). 3030 leds from sunlike is about 0.6w each. Do you really need 350w (5x10x7w) led strip?

These are running at 12v 1 amp. That’s 2.4 watt/meter. It’s about right, to maybe a little dim. 3watt/meter would probably be perfect.

there is no 0.05w or 0.1w sunlike leds in this world, so, there is no led strip… I could not find any pcb like I need, so, I drawed it by myself. It is not led strip, it is pcb what need heat sink. Also you can use only 2S (2pcs) leds in one board, it will about 12v, but be carefull, use resistor.

Also the same 12w will cost 17$ from me (20 leds and 10pcb boards 99mm long) or 14.5$ if if will be 22mm pcbs.

What’s the target market for your high power led strip? Are these for grow lights?

22mm can be used in flashlights because there is not high voltage (36v) like in COB sunlike. For growing I use another leds. But if someone already use sunlike bulbs where it is possible, he can use sunlike for plants. Eyes first, plants after =) Will go to sleep, sorry.

I drawed this 99x12.5mm for alluminium profile for led lamp 60sm, but also it can be in another size. It will be about 30-36w led lamp 60sm long.

That’s some cool looking aluminum extrusion. Good job :+1:

One suggestion, it's much better practice to connect LEDs in series first, and connect those series strings in parallel.

Reason for this is LEDs Vf variance, if you connect multiple LEDs in parallel, current distribution could be unequal, LED with lowest Vf will draw highest current, and because of that if will become hotter, and Vf would drop even more, current would rise even more.. etc. I've seen this problem in LED T8 tube light, shadows and bright spots were visible because of unequal current distribution and measurements confirmed that.

With 3 (or more) LEDs connected in series first, all strings would have total Vf closer to average (more leds - more equal average total Vf among strings because of probability laws).

I understand this situation, but:

1. seoul semico recommended to use their 3030 leds to 150mA, I recomend to use it on 85mA and I will use it with 0.5w
2. quality of leds is really good and it is almost with the same voltage.
3. when 1 led will die (shit happens) when those series strings in parallel, string will not work. If here, for example, 1 of 4 pcs will die, another 3pcs will work only 1.333 times more than 4pcs
4. in my situation it is possible to use it 3S4P and 2S4P and 1S8P


I changed price to 3030 leds on my web-site to 0.5$ and power too (now it is 0.5w, was 0.6w)

But seoul semico say that it is 150mA and 200mA max current. It is not good power to this leds, because the size of crystal not 1w. I mean it will die really fast with 150mA.
———

I just draw mixing 3:1, 2:1, 1:1