Atm I am using t5. But as soon as I can afford it 400w mh with a lumatek ballast. A 4ft t5 with 8 bulbs would work as well but will use the same electricity and cost more in bulb replacement. If you use an 8ft light mover you can offset the extra electricity by growing that much more per watt. You will get a full head of lettuce in 6 weeks from seed!
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