<a href=showthread.php?s=&postid=9912974#post9912974 target=_blank>Originally posted</a> by otterpop510
what are you looking to do?
my thoughts, but i'm sure others with more knowledge will chime in too.. in terms of intensity MH are considered the most intense, partially because they are a point light source versus a line one (which are all the other flourescent options, including t5, pc, VHO, etc.)
generally people going for sps or other high light need tanks seem to stick with MH or T5. T5 will potentially allow the same lighting output based on the number of T5's you use the the type of reflectors.
PC and VHO are also good for reef lighting, VHO's have the nicest atinic lighting choices. PC's are considered a cheaper option initially, but often add up in terms of lighting replacement if you want to replace every 6 months.
the HO (high output) and NO (normal output) floursecents will not generally work for reef tanks unless you have low-light requiring corals or FOWLR tank.