Reef Aquarium Lighting: Introducing the Lighting Lab

Introducing our latest feature: the Lighting Lab!  Lighting is one of the most discussed, yet the least understood aspects of the reef aquarium hobby.  Misplaced "which lighting is best?" questions abound on aquarium forums everywhere, so I've started a column (as well as question and answer, so ask away in the comments section!) to lay out some science and help dispel some of the untruths, misconceptions, and plain unknowns that reef aquarists may have about lighting.  The introductory topic will be a quick and basic coverage of visible light.