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Update 2 - new formula. As I need 2 more lamps, I brookered the following deal: I provide chips and drivers, and the chinese company builds the lamps, and ships them overseas. This means only 1 shipment, and reliable sources for the main parts (chip, driver). Price per lamp is...

Seems correct. The docu reads "2 channels", each one powering half the leds. Probably because finding 300+W drivers is nearly impossible. In the high end tiny pc world, they also use 2 bricks because of that. As soon as there is a TME link, I will post it.

Checked it out: min 365nm - not enough to make UVB. 365nm seem widely available, and nichia claims power output record: http://www.nichia.co.jp/en/product/uvled.html

Thank you for your prompt response. I think there was once a SurpaSPL post about short wave spikes in high blue COB light (6500k+) inducing the plants to think it's actually beeing bombared by UVA/UVB.

Is there an UV thread similar to the "far red" one ? I'd like more infos about potential use and misuse of UV Leds. I'm not growing marijuana, but using LEDs for indoor greening (fragrance+vegetables). Does it really help fighting fungi and bacterial diseases ? How about inducing flowering ...

Thank you so much - really useful thread. Has any of you cross-checked the results with support from cree or bridgelux? They surely have all that data...

I'm myself fairly new to the LED world, but I happen to bring a lot of experience from the DIY cpu cooling world. A few thumb rules I would advise: 1. Do not touch the surface of the LES. Never. Especially not with a Thermometer. On cree chip, there is a Temperature measure spot on the top. 2...

Just saw the news: Citizen has a new 30k Lm chip: CLU055 - check it out: http://ce.citizen.co.jp/productse/info.php?no=108

Update: Finally got a reply from the manufacturer. It's indeed cxa 3070 bought on some obscure Taobao reseller. They have no idea what bin. I pointed this is not the chip we agreed. Let's see how this thing evolves. Also, once mounted on the ceiling, the lamps run much hotter. I have no precise...

I didn't want to start a flame war. No doubt CREE has good chips. But are they really worth it ? To me, it looks a bit like a close circle - the type of circle Intel or microsoft for an instance have built an empire upon, and have laid waste in the land of competition. Hype = more infos...

Hello, there are actually quite a few alternative to either cree or hps. Take a look at japanese chips. High quality, and half the price of cree. Citizen has awesome chips. COB industry is in its beginning - lots of competition, so it's worth looking around. As for chinese chips, you find a lot...

Now that was helpful. Thanks alot Greengenes. My chips are written 3070N in grey. Can't say if it was black or gold. Still waiting for a reply from the manufacturer, but from what I pulled here, they are probably cxa. Thank you again guys - really useful stuff here. I'll update when I have more...

Thanks a lot for the clarifications SupraSPL. Didn't notice the gold-glint, but I will check again the trace pattern. From What I can spot on your pics, cxb has perpendicular traces on top and bottom, while cxa doesn't have it, am I correct ? Sad though that cree doesn't work with serial numbers...

I doubt I would get any refund. In industrial deals, an error usually means a discount on the next order. If it's a cxa 3070 AD they sent me, there is no big difference anyway. But between cxa Z4 and cxb BB, a rough estimation gives 800-1000Lm @50W difference !

Thank you for the reply. Nah, the heatsink covers the LES surface, which is all that counts. Waiting for more imput about that "3070N"... Though what you post looks a lot like my chips, which would point towards cxa 3070. *sight*. Anyway: I asked the manufacturer for a proof of purchase. No...

Maybe they screwed me, and it's a fake cree, or a cxa. I'll try to get another pic of an unmounted lamp, than you can see for yourself. I don't have another cxb3070 at hand to compare, so what appeared genuine at first glance might not be so after all... EDIT: Here you go. Anyone cares to...

Overlooked this one. Good call, but tricky. Large fans like 120-140mm can easily draw 2W. If you count one fan per COB, and use like 8-10 COB arrays, this is a lot of power for a solar panel. Than comes the mounting problem: granted you find enough surface, where do you fix it ? Sides get...

Actually 32$ is from jerry @Kingbrite. Don't you get his newletter ? For the rest, without driver, the price for a complete lamp was actually 35$/pc. I can pm you the PI if you are interested- can't make it public though.

Just checked again: 25$ is for large quantities. Retail goes for 32$. Sorry to disappoint. Still makes me wonder have my chinese guys managed to pull a 40$ cxb3070 lamp including reflector, glass cover, huge aluminium heatsink and (albight cheap) driver ?

Good point. Asked at least 10times, but never got a clear answer. I guess most of them are AD, but I can only confirm once all lamps have been tested. Maybe some BBs are hidden in the lot :) If you want a precise bin, you have to get the chips yourself and have them shipped to the manufacturer...