If you want humidity, put some water in a bowl and blow a fan on it, also dont use much extraction, unless you absolutely have to due to heat issues. Also no reason to run 2 lights for 4 plants in relatively small pots, put them as close as you can together and put one light on them, for the first 2-3 weeks at least. Looks like you could put all 4 pots on one of the trays maybe even. No reason to waste electricity when they arent even above soil yet, unless you really wanna. Dont put the lights too close early on either, let the plants grow to the lights. You should be able to tell when they can utilize another light, basically when leaves start to overlap significantly or coverage isnt good with just a single light, then give it to them.... Will be watching! GL