A question I get a lot is what light do I need to put my seedlings under and for how long.
Seedlings don’t need a 400watt MH or HPS light on them. Though if you do use one keep it as far away as possible. Fluorescent lights are better suited for seedlings. They can stay as close as 2 to 4 inches from the seedling ensuring they don’t stretch and get enough light penetration.
A grow spectrum is needed (or best suited) for seedlings. So a 6500K color temperature will work. FL and CFL are basically the same and most used for seedlings. I think about 15 watts per plant should do it.
Now how long do you keep them under the fluorescent lighting. Personally I would say 1 or 2 weeks. Depending on the medium you use. You can up the watts in these weeks.
When roots start to come out of the bottom of your medium its time to transplant.
Any other suggestions?