Catherine I agree with you that efficiency is critical, especially when you look at lighting. LED is the way to go in regards to energy. As for cost, there are a lot of alternatives. I know there are fans of Aquastyle LED's on here...they can be reasonable. I think the multi chip leads from some eBay vendors can be amazing as well.
Keep looking...plus LED will give you your shimmer.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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