Introduction to this FAQ

Written by Richard Sexton in 1988, updated a few times sience then.

Explained

What CRI means, what degrees Kelvin means and why they're important.

Not Great

Screw in light bulbs generally have no place in aquaria lighting. There's a couple of exceptions though.

It's probably reasonably accurate to say most aquarium lighting these days is fluorescent, and there's a good reason for that.

A Bright Idea

These are the most powerful - and expensive - kind of lights there are.

The wrapup.