When should I replace bub?

the normal life of a HPS bulb is about 20,000 hours and about half that for a MH bulb. but that doesnt mean that the bulb is good for 20,000 hours, it just means it will last that long. i replace my bulbs after every harvest so that i get the best possible harvest everytime..
 
Most people replace there bulbs at least once a year.But if you have the money every grow.Good Luck & Stay Safe!!
 
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