Thanks for that last pic especially! Really answers a lot of questions about cob lighting right there. Worth a thousand words!!
TBH, he still under lit IMHO, I think 4 T4's in each tent would be tip-top.
that's only 500watts a tent. and a little far away in height.
what I can notice and I suspected is the tent on the left has the angels, and to ME has better projection in to the canopy. it hard to tell its kind of jungle in there lol.
I love my T2-1400 in every way but the fan. It's a powerful and very effective fan yes, but it is noisy as all hell. Runs neck and neck with the air pump in being the loudest pieces of equipment in my garden.
I don't have a problem with fan noise, and my T2 is awesome, it was the T3 I though should have a second fan, its right on the edge: I can see how a one fan works, and two is wayyy more then enough. so its kind a price problem I guess.
(guessing numbers) if one fan is doing 89% of the work, but leaving 11% of loose thermals: and you add a second fan just to cover that 11%. maybe you could have some fan options, maybe a fan speed controller with the dimmer T3(2.1) or lower RPM rated fans, which is nice cause they would be quite like some people want.
I never said the light was bad with out a second fan, but that I thought the fan/sink. I just had problems on warmer days. I never thought the lights were over heating or anything.