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Mr. Skunk....
If possible it is good to change your bulb at least once a year ( or every 4 harvests) some bulb companies claim that their bulbs last for several years...
It is more important to change the HPS bulbs in the flowering room then the bulbs in the veg room...
this being said.. there are many growers that never change their bulbs..
It is also important to clean your bulbs (with rubbing alcohol) regularly,,,, of course, you do this when the lights are off..
iloveyou
cheers
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