With an heirloom variety I'd wager that's not enough light. We recently vegged three mortgage lifters in a super cropper. Till they where about 18" tall. They grew great and are now producing fruit in our coco system in the greenhouse. We used 4 UFOS. When I have tried to grow Romas and Little Mamas under 180W or less I haven't been successful. However little mamas where also successful along side the lifters. So I think the extra light made the difference.
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