LED Stairwell Lighting promotes energy efficiency.

RLL Stairwell LED Radius Wrap delivers efficacies of >100 lm/W and integrates occupancy sensor that further promotes energy conservation. When stairwells are empty, LED-based fixture dims light output by 50% to cut energy consumption in half while still providing base level of illumination as required by NFPA codes. DesignLights Consortium

[source: http://news.thomasnet.com/fullstory/LED-Stairwell-Lighting-promotes-energy-efficiency-20015242]

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