I've got about 30 phals to put under a light, we are moving to new location without good natural light. From what I read, I understand that T5HO is the most economical. Can someone recommend a good source for the fixtures. Also, what size would you recommend? (1-2 lamp 48") (2- 2 lamp 48"), or (1- 4 lamp 48"). I am not sure how much light it will require.