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A recent National Electrical Manufacturers Association (NEMA) paper finds that claims about the energy efficiency of photoluminescent exit signs may be overblown. Such claims rely on the fact that the signs themselves do not draw any power. But many codes and standards, including the International Building Code, require that the signs be illuminated at least 60 minutes prior to building occupation; manufacturers note on the signs that at least five footcandles of external light must be available to charge the sign during occupied hours.
According to NEMA, these signs require light fixtures for charging that use far more than the two to five watts used by internally illuminated, LED exit signs.
Given the additional lighting needed to charge these exit signs, they will likely not be as low-maintenance and cost-effective as manufacturers claim. The NEMA paper points out that a skilled electrician is needed to install light fixtures near the signs in order to meet manufacturer specifications and code requirements. These light fixtures will also require maintenance and additional lamps over time, further limiting their cost-effectiveness.
source: NEMA Dec. 16, 2009
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