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09-20-2009, 07:13 PM#3
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How do I tell if a HPS bulb is spent?
^5s Image Reaper , I don't mean to hijack this thread but I've been using the same 400 watt HPS bulbs for about 2 years now. What is the lumen decline with these bulbs? I believe they start out at about 50k lumens but after one year what , in your opinion is the lumen output?
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