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Can you please delete this thread? It got addressed by support. https://www.rollitup.org/t/hlg-customer-service.985149/page-2#post-14768355

I was stoned. Meant zips :bigjoint:

Atreum got back with me, <70w without a heatsink should be fine with adequate air movement. An oscillating fan or a couple small stationary would probably suffice. It's always a good idea to have a infrared thermometer to verify surface temps. Both companies spec their boards at 50C.

I honestly don't know for certain if atreum boards recommend to run their boards without a heatsink at 70w. HLG states 288v2 boards as needing a heatsink at over 75w so you would be good in this application. I emailed Atreum and will update when they get back to me

Airwalker is crabby, he has been for about 3 years since he stopped asking questions and started answering them. If you want a fair increase or at least similar yield, I recommend running cobs or boards at around 36w and aiming for 35w/sqft. As far as lights go, most meet at around 25w so its...

You can run 9x120 boards, but you are aiming for a big pull. Consider this: folks can pull 2lbs in a 4x4 with 1k hps. Folks can pull 4lbs in an 8x4 with 3x 600hps. Less watts but what else changed? Better overlap and a slight efficiency boost. you need 2.5 lbs in a 4x4 with 555 watts of light...

I was referring to 9x 288.2 boards. You would be running them just under 70w per board. 9x $60=$540. 3x $53 for drivers=$160. +$50 in miscellaneous. You are looking at $750. But the intensity and overlap, you should be seeing 1.75 or better on the regular

I realize this makes the upfront costs quite high, but if you want to see 2.0 gpw production you need to drive these boards at a low current while still shooting for 35ish w/sqft in my honest opinion. At least running these below 70 watts saves some $ on the heatsinks.

If running 9 288's in a 4x4, why not consider running a 185h-48a x3. Put one on each run of 3 boards. Should be able to bump the current up to almost 1.4 per board. You still get close to 600w but it's easier to manage one driver per module. Also you would be above 35 w/sqft.