Since 2007, more energy-efficient lighting has been replacing incandescent light bulbs in preparation of federal standards set to become effective this year. The Trump administration rejected these standards last month, but incandescent bulbs still are on their way out.
Read MoreResidential LEDs use at least 75% less energy and last 25 times longer than incandescent bulbs, but R&D challenges still exist for LED lighting. However, new materials research continues to push LED technologies further forward.
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