I have a question regarding aquarium lightbulbs. I read constantly that there are two types of lighting - fluorescent and incandescent. I am wondering which one is fluorescent and which one is incandescent. What is the difference between them? Is one somehow better than the other? Do these two serve different purposes? I currently have a Hagen's Sun-Glo 20W lightbulb. Is it fluorescent or incancescent? Before, I had a lightbulb with a bluish light (which I hated, and changed for Sun-Glo which is a natural-looking light). What kind of light was the one I had before (the bluish one)? It was some standard light that came with my tank's hood. LOL, sorry if my questions sound silly!