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I previously had a 250W MH retrofit kit I bought for $150. XM bulbs online are maybe $65 and I replaced them once a year. Over 10 years, thats $800 in costs. If there is really any savings in heat and electricity, is it going to save you $1700 over 10 years (Assuming the thing even last 10 years, with cheaply produced modern-day electronics, I'd be suprised if it lasted 5...)
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