If they tend to be more active when you water they are fungus gnats. They lay eggs in the moist soil and are generally harmless but can get into your roots. There are countless threads on the perils and solutions. You could probably benefit quite a bit from a 400w digital ballast/hood/hps setup. If you put them into flowering the first of September they should be well into their stretch by now and beginning the bud swell. I have a blue mystic plant that I started flowering the first of September and it was six inches tall. Now it's almost four feet. I'm no pro but a 400w digital ballast/hood/bulb combo can be had for under $200 and delivered in a couple days from Amazon. Buy some of the thick foam insulation at HD that has the radiant barrier (foil) on it and cut/build walls for your room if you have the chance. It's really about the best reflective material for your dollar. You won't need massive ventilation with that light.