I know you'll probably not do this, but... Crop the top off at the third set of leaves and again when those tops have put out two pairs of leaves. Use CFL lamps, cool white for veg, warm white for bloom. With the topping you'll not loose anything but have a nice bushy plant instead of a long stringy plant. This is much better for the cfl lamps as they have to be within inches to do much good. It takes quite a few CFLs to light a 3' + tall plant.