I have had good success with using 48" fluorescent
lights. Most hardware or home improvement places
sell them. The seedlings need to be about 8" from the tubes. I use twin tube shop lights, make sure you use either plant grow bulbs or if those aren't available, a cool white or natural
light bulb with a CRI of as close to 100 as you can find as cheap bulbs with a low CRI will not work well.