16x Citizen 1212 Gen 6 COB/Blurple Hack

Well guys here's my first dip into diy led. One of my very close friends and fellow growers sold me these blurples after 2 harvest for $60 for all 4 lights. Originally he wanted more for all 4 but no one on Craigslist would bite. After 1 average harvest for me with 2 of the 4 lights I decided to hack them. Pictures will be of 1 light build and final results of all 4 as I go. Here's the build.

4 Cobs per light/2 Cobs per driver

Driver Specs

Here's the blurple driver/fan setup. Big fan with it's own driver for active cooling.


Heatsink is decent size for 4 chips active cooled.


Here's my progress so far. Tapped and Mounted the heatsink to the frame and ready to mount/wire chips. My order is in the mail so i'll update when I get everything.

Each pair of cobs will be in series so they will be connected to each other. What will be the best placement for the chips. Together or evenly spaced apart? Also do you guys think I should mix the color temp with the rest of the lights since it's 4 cobs per light (3000/3500k). I want each light to cover 2x2 evenly.

I would mount them like the plate on the right but I would orient them rotated 90deg. That should give you a better distribution for the fixture.

GBAUTO said:

I would mount them like the plate on the right but I would orient them rotated 90deg. That should give you a better distribution for the fixture.

Click to expand...

So that does look good to me. Nice even rectangle.

First ones done. Shout out to @CobKits for the parts and help. Will be buying the remaining chips within the next couple paychecks. The heatsink stays cool even without the fan on so I guess if I crank them up with a HLG driver in the future they'll be good on cooling. Probably go with a big constant current driver and gut the rest of the blurple to fit it all in. I'm using a lux android app on my Samsung Galaxy 8+ so I really don't know if the numbers are good but it blows the blurple away for coverage and intensity according to before and after readings. Keep you guys updated.

So I will be buying the rest of the chips all at the same time to save on shipping. That should make it around $60 per light for pads and chips. Add the $15 bucks per blurple. That makes it roughly $75-80 dollars per light. Well under a dollar a watt.

Second light is done. Went with the BJB holder for a cleaner look. In the end I will be getting reflectors. 2 more lights left to make.