How long does a MH bulb last?

sen5241b

Reef enthusiast
I put a Sunpod 150 watt over my tank on April 29. It been running on average 9 hours a day. When should I replace the bulb?
 
When changing bulbs had anyone ever had problems with light acclimation? A new bulb could very well change the spectral output.
 
+1 Winy

A new bulb will have more PAR than a old, used bulb. The spectral output (color) has no affect on corals, but PAR values can. When you change to a new bulb, you can drop the time your MH lights are on by a few hrs/day and gradually build it back up.
 
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