metal halide bulb

[envy]

i would' do that by the time the corals tell you its time it might be to late to bring them back to health. unless you have a lux meter than great but if you don't try to change them out within the next couple of months. especially if you have sps or some harder to keep lps

[aquasport24]

Buy a new bulb and save the old one for spare.

[alton]

European lamps are just better quality. Of the lamps I have used, only the Reeflux are Pulse Start. XM and others are Probe Start. Pulse start lamps and electronic ballast work better together. I have had Coral Vue DE Lamps go bad in 8 months and lost half of my SPS because of it. If anyone else knows of any other Pulse start lamps please let me know? A meter is the best way to check lamp life.

[envy]

there is a difference in bulb life based on brand. this info is going for the hamilton brand bulbs. as far as xm and coral vue you have to check there site to see when bulbs have to be changed out.