I never said I applied foil to the walls....
I apply it to wood and cardboard, and mount them to the reflectors(at specific angles and sizes), which are on chains, so they get lifted out of the shots.
And hang them from the walls with adjusters to get the right angles.
I don't use reflectors beneath the soil/top of the container... I do have some aluminum cans attached to the sides of the buckets, though. they hold themselves on. Then on the walls, more aluminum from cans, which were cut into rectangles and folded into each other(an experiment).
There's a mirror visible on the left, in the latter shots, though. Reflectivity isn't a very big deal with small plants....
I use 161-182 watts total. Started around 2 dozen seedlings with, uh, 51W(2x26W). Got 11 decent females. Half got exposed to around of day of very high temperatures... they're not doing well(has nothing to do with lights or foil, FYI). Three have already died, and 1-2 more are probably going soon... so hopefully 6-7. The inside of the stems turns to the color of shit, and the plants just rapidly undergo necrosis.... They're uncloneable, so I've had to chop my ladies a bit... sigh.
I think 2 will recover from the heat stress, though they've lost a shit ton of foliage. They are really bushy at the tops, and skinny as shit below that. Not pictured is the ones that's very likely already dead. It has massive necrosis... nothing worth seeing.
I call these two Goku and Zorak, though. There's aluminum in the background, too!
Check it out, maybe it's just me. I attached a reference for those who don't know who these characters are.