I'm working on finalizing documentation for a LEED project. We have completed the calculations and are only looking about 15% savings. However, all the installed ballast are dimmable and all have been set at 70%, is there anyway to account for these savings?
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Dane Sanders
PrincipalClanton Associates
68 thumbs up
December 21, 2011 - 7:17 pm
For the LEED CI EAC1.1 - Optimize Lighting Power Density, we have previously submitted documentation showing the connected lighting load in each space, and an additional column applying the fixed dimmed level and resulting reduced power. The important thing to verify is that the 70% dimmed level is actually 70% power. A lighting control company might consider 70% of the 0-10V control signal, a lighting designer may want 70% light output, but for LEED this must be 70% of power. You may need to clarify with the controls manufacturer what the 70% is.
Also, you will need to provide a narrative that confirms that this maximum dimmed level is set in the firmware, or is otherwise a permanent setting that cannot be reprogrammed by the end user.