I have a pre-manufactured tank (platic hood with built in lighting case, filter etc) that accomodates for compact flourescent lamps
. The case is an Aqua-one 620T - roughly 38 Gallons. Slap me on the wrist if you must!
I've done alot of reading about lighting for the possibilty of adding corals down the track. I read a large article on lighting which pretty much stated that all pre-manufactured tanks of this nature simply cant accomodate reef due to the poor lighting options they provide.
But then at the end of the article it breifly mentions this type of light and says that one 9-watter can be equivalvent to 75 watts. I didn't really understand this. Here is a link to the article: Reef System Lighting - What to Buy and Why - Using Power Compacts
TLDR: Can I do much reef keeping with two compact flourescent lamps in a 39 Gallon tank. Currently I have a 18Watt Marine Blue and a 50/50 something that I'm unsure of. (came with the tank)
Excuse my lack of knowledge on the subject