You can raise your fixture 6-8 inches, no problem. As far as Geraniums go, you can remove them from their pots in the Fall (with roots attached), and hang them on a wall in your basement (or somewhere out of the way). They don't need any water or light, and when Spring begins, like magic; they will start producing new bud growth. My Mom, and Aunt have been doing this for years. No need to buy new ones each year.

Rob

When starting seeds under lights, the lights need to be very close to the seedlings or they will get leggy. The heat from the lights with 65 degree room temp is perfect. Make sure there is air circulation.

Full grown plants may have different conditions from seedlings.