MH question

ReeferScooter

New member
I ran my old bulbs for almost a year before i visually noticed a difference in algae and coral growth. So i would say around 10 months or so. But i also tend to use my bulbs life and plus some.
 

grigsy

New member
Depends on the brand.

I change out my DE 250 watt bulbs about once a year.

I know a hobbyist who changes his every 1.5 years.
 

Bandsaw

New member
+1 on the 10 months. I start to see algea growing on the sand and the corals start to complain. It's time to change bulbs.
 
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