There are 6 100 watt CFL's. I am adding another bar from the pond today to make 10. The best lighing from using the following: 1000 watt Metal halide--shop lights with 4200k --CFL's 100 watt--T5 flour 4' tubes 4 and 8 bulb units.
I have to say hands down that for the floating raft T5 tubes are the best. low heat and low power comsumption for the brightness and spectrum--i have mixed bulbs in one side and just veg in the other and the mixed bulbs are the way to go. 3000k flower and i think they are 5000k veg--the T5 units cost about the same as a 400watt MH/HPS system.
That unit is 4' x 8' 24" of water on the bottom and 12" of water on the top--I made a gravel/oystershell/plant and mosses from the forest filter out of a old ugly 55gallon tank i got off of craigslist for 20 bucks. The black back side is towards the lights
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