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specifying lighting in CBECC-Com

asked 2014-11-04 18:57:28 -0500

NORESCO's avatar

What are the options for specifying lighting? Is lighting power density the only method used?

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answered 2014-11-05 11:43:30 -0500

cbecc's avatar

Lights can be defined as a lighting power density or within a lighting system. The lighting system method allows the entry of luminaire types and the quantity of each type in the space. Each lighting system can be assigned to a daylit area type for use with daylighting controls: Skylit, the portion of the floor that receives daylight from a skylight; Primary Sidelit, portion of the floor that receives the highest amount of daylight from a window; Secondary Sidelit, portion of the floor that receives a lower, but still useful, amount of light from a window; or none for that portion of the space which is not daylit.

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answered 2016-11-30 15:09:54 -0500

Is it possible to account for daylight dimming if using the lighting power density approach?

I have a project where the LPD has been specified equal to the allowance, the lighting is 100% controlled to a lux setpoint for each zone with daylit area (primary and secondary). I would expect the energy results to be close to the Standard model, but it's 34% WORSE.

The project has 100% dimmable LEDs with daylighting everywhere possible, and I'd like to take credit for that without having to specify every fixture in my simplified model.

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Asked: 2014-11-04 18:57:28 -0500

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Last updated: Nov 05 '14