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CI-2009 EAc1.1:Optimize Energy Performance—Lighting Power

LED Lamps in Luminaires Designed for Other Lamps

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Elizabeth Eason
LEED Fellow
Elizabeth Eason Architecture
LEEDuser Basic Member
8 thumbs up

We have a project with 2 different pendant fixtures that the Owner really wants to use - but they are designed for MR-16 and incandescent lamps. It appears that, according to ASHRAE 90.1-2007, regardless of the lamp used in a fixture, LPD is calculated using the maximum rated wattage for the fixture. Is it correct that a fixture designed for use with an MR-16 or incandescent lamp, but utilizing an LED lamp, must still use the MR-16 or incandescent wattage (maximum rated) in energy calculations? If so, is it possible to use a low amp breaker just for those fixtures to limit the available power, thereby lowering the LPD? Thanks!

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Bill Swanson
Sr. Electrical Engineer
Integrated Design Solutions
LEEDuser Expert
516 thumbs up

Fri, 11/09/2012 - 21:45

You are correct. The wattage is based on the maximum that can be installed in that fixture. Some companies will add at the factory a UL sticker with a lower maximum wattage listed. The fee for this is negligable since it's just a sticker that's changed. But if you can get a company to do this then you can use the new lower maximum wattage.

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