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06.21.2009, 09:41 PM
Its the way they are wired up, to take mains ~240volts, with bulbs to match. Kinda like the difference between cordless and mains powered tools. Would make more sense to have just the mains powered ones to save money, and fit them with more efficient bulbs like you get in homes these days. But, that would make sense wouldnt it now?....
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