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.
I don't think the brand of the light fixture matters much. I've used the twin tube T12 or or T8 shop lights. Choosing good bulbs is important though. Since they don't put out a lot of heat, the seedlings can have their upper leaves as close as 6" to the lights without heat damage. You would need several lights to completely cover a 3' by 4' area as each light only illuminates a 1' wide strip due to being so close to the plants.
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