Celene, I have switched from T-8 lights to T-5H lights. These T-5H lights (6 tubes/fixture) produce extremely bright light, about 4X what the T-8 fixtures produced. They are so bright that I had to move them a minimum of 2' away from my cattleya orchids, and cattleya love bright light. The lights were actually producing "sunburn" on some of my cattleya! They will/should give you plenty of lumens to keep your citrus going.
