some good reads about lights!
 

http://reefkeeping.com/issues/2007-04/jb/index.php
i thought it was good

lights
 

good article................I didn't realize there would be such a big difference from lights used.............interesting from power consumption as well

Glenn

hqi
 

those are some crazy PAR values with an HQI ballast...... if you aren't too concerned about the power consumption factor.

that's been on the reefcentral lighting forum for a while. I really like how he took pictures of all the lights, and you can compare the colours of the various bulbs.