In article ,
John Hines writes:

And you can find special MH lamps at pet shops that specialize in
sal****er reef tanks, which can use lamps with very (10K, 15K) ratings.

I've got an Aqualite 250W 10,000K one, and it pumps out rather
large amounts of ozone -- you wouldn't want to run it indoors
for any length of time. It must be run behind a glass shield to
protect you from UV (these give off more than regular MH lamps)
and hot debris if the lamp explodes at end of life.

--
Andrew Gabriel