sweet build randy.so are the thermal switches to control independant fans of for dimming each cob ?
No, they will be in series with the cobs to prevent them from burning out if a fan fails.
Yes the cobs are in series with NC thermal switches KSD301 70°C. It will cycle four of the eight cobs on a single fan failure as the thermal switch will reset as the heat sink cools by convection and wind from the other fans. There are two driver circuits so four cobs would remain unaffected by a single fan failure. In a total fan failure, such as a power supply failure all cobs would eventually cycle off and on. Since I am using an Arduino to control all aspects of light timing, CO2 and Exhaust Fan I could add a sensor to warn me about a heat problem but I just don't think it is necessary. I consistently check on my grow at least twice a day so that is a short time for any failure to cause much of a problem.
very nice and clean! I love the way you spaced them out on the frame, what space are you covering with that?
I love DIYs
Yomandude: thanks. I have a 3x3 right now but will be upgrading in the near future to a 4x8 since weed just got legal here. I will build a second light at that time; the plan is to cover ~ 4x4. I did not use epoxy because I may upgrade the cobs to Cree sometime in the future. The price on the 3590s should be coming down when they release the new 200W cobs.very nice and clean! I love the way you spaced them out on the frame, what space are you covering with that?
I used the Alpine 11 plus with Vero29s at 2.1A (around 80W) and they barely even get warm. I used Epoxy thermal paste, much easier and cheaper than machining, glued the COB and the holder with it to hold the reflector. And on the ones I put lenses I simply used self taping screws.
Good work!! you do have a bit to spend on it, but it is far less than a pre built light!
.
I have 2 separate bloom areas , the first one I made with 3000-3500 CCT and the second was a mix of 3500 and 1/4 4000 ...so far the resin production with the additional bluer spectrum is killing it in resin production. So much that I have order some 5000k cobs for the all red bloom area.
An update for all those that care, I got the 5000k cob, all I can say it's a huge difference in trichome production after 7 days. My pineapple express went from dry to sticky. I use UV bulb, but I am thinking the combo of red and blue cct is the answer. It makes sense because with the input of the blue the light is closer to the sun at it's strongest during the day, making the plant think it needs to preserve it's moisture. currently now both of my rooms have 25% 4000 and 5000k cobs. This is definitely not a fluke because with the ease of replacing cobs I was able to do a controlled experiment. Happy growing, can't wait til harvest.
I am very happy with my 5K Cree's in veg and my three autos just started flowering under them. This is a strain I have grown before and it's know for being full of trichs and resin to begin with so I am VERY curious to see how the 5K does for them.
4 Clu048 1812 3500k 90Cri in the center and 6 Clu048 1212's 3500k 90cri on the outside. All driven by 2 Meanwell Hlg240h-c1050b drivers.