Hi mate, I would suggestion use CFL bulbs or a floresant light while your plants are small. These are cool so no chance of frying your plants, keep the lights close a inch or two away to stop them stretching. Tall weedy plants at this stage is not good as the stem will be week. This saves on electricity, and can be used until you change to flower. I leave my lights on 24 hours while they are small, and when they are 6 inches or so use a timer and give 18 hours on 6 off, it gives the little tinkers a rest in darkness. You may think they are not growing fast, but believe me it all going on below, as you will find the roots coming out the bottom, it’s then you need to repot, water the plants and leave for a while before turning your pot over, the whole lot will come out with no damage to the roots. I would suggest you grow with coco, it a good way to start rather than soil, I have been growing 4 years and have always had great results, ps don’t tell anyone you are growing, some gob by buggers out there. Happy growing it’s easy.