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[/B] The color of the greatdel 20,000K bulbs are pretty nice though if they have decent output. Even if they are 6 month bulbs, 20 bucks a year is a huge savings. [/B]
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Just spoke to the USIHO gentleman here at MACNA in pittsburght and he said his bulbs have an avaerga life span of 6000 to 8000 hours. That is about 2 years of 8 hours a day. $75 dollars for the lamp 400 watt and it is not to much savings.