Good news on the move and the job man, how did the doctors appt. go when you told them you're licensed to smoke MJ for illness? Pretty interested because I've been weary about going to temp agencies thinking my MMJ card will be worthless to them.
About the light, if you were using a lot less intensity before the switch to the new light keep it as far away as possible and day by day move down to within 12-16 of the canopy. Your plants will tell you if they're taking to it well. Also not sure if putting the light that close to the plant will give you the footprint you need to cover all 3 of them. Is the hood vented?
Makeshift rooms are fine as long as you don't have any light leaks, I'm sure you covered that already though. I'm stoked for you man!