LED-based lighting is still far from a mainstream technology, and its designs are in flux. Early SSL products are making their way onto store shelves and into inventory. LED lighting teardowns: Five lighting designs that illuminate the future of lighting article shows product examples that can indicate what direction SSL design will take, at least in its early stages.
Also consider SMD LED technology. They are much more efficient that refractor LED bulbs.
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This site uses Wordpress blog system.
LED is the future for sure
Samsung LED light bulb teardown includes objective dimming numbers
http://www.edn.com/blog/PowerSource/41611-Samsung_LED_light_bulb_teardown_includes_objective_dimming_numbers.php
Notice that the incandescent bulb (yellow line) does not dim linearly with power. It’s main achievement is that it does dim down to zero. A CFL does a better job of dimming with power, and the Samsung LED light is very good, dimming quite linearly with power. However, it drops out at just under 20% of its max output light. (Which, however, more than meets the L-Prize spec.)