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Is it possible to run 2 or more cob leds off of one driver. Or more directly, can I use a 400w driver for 4-100w cob leds? What is the worst that could happen?

Happy Happy, thanks for the comment. The COB LEDs are the cheap Chinese, Ebay items. How do you check, verify the color? I have been importing other hydro items from China for years and know that specs need to be double/triple checked. I do have a stellernet spectrometer that reads 200-1200nm...

Here is my second build, part a. I am using a 20 inch box fan for my project, box fan serves as my frame, and cooling fan for the COB LEDs Please let me know your thoughts, comments, critiques.

Super, Thanks Great info, explains it all.

I was very curious to see this device. I am a big believer of getting my hands on any gadgets, particularly test equipment. http://www.ebay.com/itm/371041491688?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_3617wt_1071 15KW Power Electricity Saving Energy Saver Box Save 30% US Plug I...

(In advance, please forgive me if this has already been covered)..... Yo Super!? I see lots of led drivers on Ebay that are "Constant Voltage". For our COBLED projects, I understand that we use/need "Constant Current". I don't get it? What is the purpose/use of the "Constant Voltage" for...

Yo Super! Thanks for the kudos. Note to all on riu, please make comments and criticisms. Super? What tweeks do you recommend?

Here is my very first DIY COB LED I put the spectrometer on this and the mix could not be more perfect. Peaks at 440 and 660 Chip was 6.00 driver was 20.00 heat sink was 5.00 Fan from thrift store was 5.00 I am going to give it to a grower friend to use as supplemental side lighting. I...

when did you write the article titled? http://howtogrowmarijuana.com/DIY-LED-grow-light it is very good

I am way impressed. Question. I see that you used 6 cob leds at 3000k and 2 cob leds at 5000k. How did you come to that determination for the color and the ratio? I am confused when I see warm white, pure white, cool white... cob leds I am also further confused by the 3000k. 5000k 10000k and...