Edit: Your thing will work. I'd assume the 40cfm is an intake fan, so you'd be right to keep it lesser cfm so it doesn't overflow your filter. In my case I am gonna use the two strongest equal fans because they're both exhaust, kinda, and I don't have to worry about pressures at that stage in the exhaust flow. Initially I used the lesser powered fans pulling because they were external and exposed, the strong louder ones pushing were muffled by filter.
Actually the 40 and 100 would both be exhaust fans.
The 40 pulling air out of the grow chamber and helping the 100 pull even more efficiently through the carbon scrubber. And the 100 would be outside the cab.
I think I'm going to drill the reflector right above the tubes. I have a 6mm drill and I worked out if I drill one hole every 1cm, directly above each tube (4 bulbs = 8 tubes), I'll end up gaining the size of a 120mm hole, approximately, and it should open the flow a lot and I'm confident I won't need fans cooling the bulbs then.
If anyone thinks this could be a bad move, please let me know your concerns, I thank you.
Cool man! Colour coded ascii art! I like how you've approached it and I don't need much convincing so I'll be going ahead with it. I'll also seal off those side grilles. I forget how many holes I calculated but it was a lot, so I'll have to take it to my buddies. He can help drilling I will use the opportunity to cut the holes in the filter box too. I can't do much power tool stuff here.
Didn't realise that about the new bulbs, thanks. I forgot to mention I found the 3000k bulbs online a lot cheaper, I think $11aud free shipping...compared to $45aud from the local lighting store!!! The 4000k's that came in there are definitely broken in - they have dark patches around the bases from the heat! (previous owner)
What's the closest I should get a newly sprouted seedling from a 55w pll bulb? Is 2 inches too close? The temp seems fine at that distance but this seedling just hasn't moved a millimetre, and now it looks to be going necrotic. Maybe it's the IR?