spraying is always a decision of potentially take some of the pesticide remains into your lungs, but has to be done I suppose. I've heard from dem blocks that some mites might actually be scared away by some rugs with animal smell like of a cat or a dog, not sure if that has anything to do with...
I'd select Sun if I could, but for indoor I'd say led, the diode light is more energy-preserving, not making too much temperature. I actually just use a grow purple light stuff I bought for rather not a huge price and it kinda works