I am CHEAP. I am in the process of making my own LED light. I think for a 55 gallon 3 or maybe 4, 15 watt LED floodlights wired in series will grow pretty much anything. I've tried one bulb over my 55 so far and it reaches to the bottom and is very bright. The bulbs are pretty tall but I think a fixture that looks nice is possible. I will be using a corrugated polycarbonate greenhouse roofing for the cover.