CS 2009 SSc8: Light Pollution Reduction

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4 Comments

Tom Fik Civil Engineer/LEED AP Carroll Engineering Aug 06 2010

Lighting Power Density

Is there maximum allowable LPDLighting power density (LPD) is the amount of electric lighting, usually measured in watts per square foot, being used to illuminate a given space. for an electrical substation?

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Bill Swanson replied PE, LEED AP, BETA Design Aug 10 2010

Interior or exterior?

for Interior, ASHRAE 90.1 does not list a building type similar to this. In my opinion the closest building type is Manufacturing facility at 1.3 W/sf. It may be better to do the space-by-space method. Electrical spaces get 1.5 W/sf

for Exterior they're all the same. It's based on parking lot size, sidewalk length, building facade.

An electrical substation seems like an odd building type to go for LEED certification.

Viann Lau Aug 09 2010

CS 2009 SSc8: Light Pollution Reduction

For interior lighting of CS 2009 SSc8, does it include covered carparking areas? If dimming of light would cause security problem, which option would be more applicable for achieving this credit?

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Bill Swanson replied PE, LEED AP, BETA Design Aug 10 2010

Covered parking is considered interior lighting with an allowance of 0.2 W/sf. Most of the lights seem like they would be shielded by building structure.

USGBC has never allowed additional lighting for security purposes. Either shield direct line of site for these lights or dim them.

One idea is to add occupancy sensors all over and when they sense someone the lighting can increase to full brightness. This is not a simple solution since many sensors don't like winter conditions or vandalism and getting good sensor coverage in a garage is difficult. I think it's easier to reconsider lighting placement and type.

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