Questions on COB build

C

Camarospirit

Member
I am new to DIY building and growing. I have spent as much time as I can on this site trying to build lights and grow medicine. One thing I learned is there is so much to learn. My state allows 4 plants for personal use. I'd rather grow it than buy it..so here I am. With the help of the many "growing gurus" here I hope to build the light that will work for my application.
My grow space is a 4x4 tent. I want to go passive so the plan is to use two 48" by 4.600 serrated heat sinks. The COB's I want to use are 10x3000K CreeCXA3070's (5 COB's on each heat sink). I see for $20.00 more I can upgrade to 3090"s...so that is a possibility.
The drivers I want to use are Meanwell 60-1400 for the 3070"s but I'm not sure what would be the best drivers for the 3090's. I'll have at least one fan and possibly two in the tent if needed.
I'm not sure if this is a viable plan or just a noob overthinking this thing. Any advice or ideas are deeply appreciated. Thank you in advance.
 
SupraSPL

SupraSPL

Well-Known Member
If you can get top bin CXB3590 for a fair price it is well worth the extra up front cost IMO.

The LPC-60-1400 is 85% efficient and non-PFC. Might be worth considering these drivers if you want to use separate 1.4A units. Generics, $11 ea, power factor corrected and ~88% efficient.

Other options, you could run 5 CXA3070s on an HLG-185H-C1050 driver and get 1.05A. You could run 4 CXB3070s on an HLG-185H-C1400 driver and get 1.4A. The HLG-120H and 185H drivers are power factor corrected, dimmable and 94% efficienct.

The 4.6" serrated heatsink offers a lot of surface area for the $, but it has a relatively thin base and may be more active cooling friendly than passive. Because of the high surface area it may overly concentrate your light unless you use more surface area than the recommendations (40cm²/heat W for active and 120cm²/heat W for passive). Profiles like the 3.5" 4.23" 4.9" or 5.88" are more passive friendly and spread the cobs further apart which can improve uniformity without sacrificing vertical space.

Good luck with your build!
 
C

Camarospirit

Member
SupraSPL said:
If you can get top bin CXB3590 for a fair price it is well worth the extra up front cost IMO.

The LPC-60-1400 is 85% efficient and non-PFC. Might be worth considering these drivers if you want to use separate 1.4A units. Generics, $11 ea, power factor corrected and ~88% efficient.

Other options, you could run 5 CXA3070s on an HLG-185H-C1050 driver and get 1.05A. You could run 4 CXB3070s on an HLG-185H-C1400 driver and get 1.4A. The HLG-120H and 185H drivers are power factor corrected, dimmable and 94% efficienct.

The 4.6" serrated heatsink offers a lot of surface area for the $, but it has a relatively thin base and may be more active cooling friendly than passive. Because of the high surface area it may overly concentrate your light unless you use more surface area than the recommendations (40cm²/heat W for active and 120cm²/heat W for passive). Profiles like the 3.5" 4.23" 4.9" or 5.88" are more passive friendly and spread the cobs further apart which can improve uniformity without sacrificing vertical space.

Good luck with your build!
Click to expand...
SupraSPL said:
If you can get top bin CXB3590 for a fair price it is well worth the extra up front cost IMO.

The LPC-60-1400 is 85% efficient and non-PFC. Might be worth considering these drivers if you want to use separate 1.4A units. Generics, $11 ea, power factor corrected and ~88% efficient.

Other options, you could run 5 CXA3070s on an HLG-185H-C1050 driver and get 1.05A. You could run 4 CXB3070s on an HLG-185H-C1400 driver and get 1.4A. The HLG-120H and 185H drivers are power factor corrected, dimmable and 94% efficienct.

The 4.6" serrated heatsink offers a lot of surface area for the $, but it has a relatively thin base and may be more active cooling friendly than passive. Because of the high surface area it may overly concentrate your light unless you use more surface area than the recommendations (40cm²/heat W for active and 120cm²/heat W for passive). Profiles like the 3.5" 4.23" 4.9" or 5.88" are more passive friendly and spread the cobs further apart which can improve uniformity without sacrificing vertical space.

Good luck with your build!
Click to expand...
Thank you for your quick response. Your information will have me rethinking a few things in my plan.
 
You must log in or register to reply here.
Top