My 600w lummi sunblaster is rated to 32,000 hours which would be around 3 and a half years on 24/7 i would take that with a pinch of salt! I read somewhere that the lumens of the bulb decrease over time so you're probably better changing the bulb yearly if you can afford it mate
Run HPS bulbs for 2 grows at the max.. They fade over time. Not worth paying electricity for a bulb that is not putting out the lumens and correct spectrum.
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