You can read the thread in my signature too

Sevin (pesticide) is very good to kill them in the room.

I would wash the room in a bleach water mix if possible, otherwise spray bleach on all surfaces.

Then take the Sevin mixed according to instructions. Every place that makes a corner in the room should get a stream sprayed along it, like the professionals do. Pay particular attention to floor/wall/door jambs. Do this once a month.

Do not get it on your plants it is toxic to the plants.

Then, use Neem in the vegitative portion of your grow once per week. Leaves will get a shine on them with that leaf has enough. I only spray on the tops, the plant absorbs and takes it systemically. You can also put it in the soil, I do not know dosage that way.

The key to mites is elimination and then prevention.