PC basic question

[maroun.c]

Hi sorry for the really basic question but it's been years I hear about PC lighting for aquariums and I never knew what it really is. Is it those spring or tube shaped power saving lamps? don't these usually cause or at least encourage bad algae growth?

[crab0000]

Those are PC's, but not the kind used in aquariums. Here's a link with some pics on it. http://www.drsfostersmith.com/product/NavResults.cfm?N=2004+113346 I don't really care for PC's, but some like them.