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PCs every 6-8 months
T5 HO Once a year
MH Once a year.

This is how often I change my lights. Everyone is different and I'm sure others will change theirs at different times.
 

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My personal list of recommended lamp replacement intervals:

Normal output lamps - six months

VHO actinics - six months
VHO daylights - nine months

PC actinics - eight months
PC daylights - twelve months

SE MH (20K) - six months
SE MH (> 10K, < 20K) - nine months
SE MH (< 10K) - twelve months

DE MH - twelve months

T5HO actinics - twelve months
T5HO daylights - eighteen months
 
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