In what kind of space would you use a prescriptive method for calculating daylight. it seems as it only applies to open office spaces in a small floor plate. And daylight simulations are applied too all other layouts with offices? What do you think? Is this too quick of a generalization?

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TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Tue, 01/17/2012 - 13:23

I would not say that the prescriptive method is a means to calculate daylight. It is a method that is used to determined whether a space meets a certain set of criteria that would provide adequate levels of light. Its like the older glazing factor calculation where the area and property of the the space is used in a set formula to determine a number, nothing is based on any type of illuminance levels. So if you are truly wanting to know the daylight levels of the space, simulations or actual measurements are the methods to use. I would not use the prescriptive method if I designed a space which has exterior shading, light shelves, sloped ceilings, or any other implemented daylighting strategies. It, like you said, is just general. If you have an open office space with just sidelighting, and or toplighting, and you just want to meet the credit requirement, then the precriptive method would be applicable.

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