[Equest-users] ASHRAE 90.1 Specific Question - How to Determine Lighted Facade Area

Ömer Moltay omoltay at mimtarch.com
Tue Oct 16 03:52:04 PDT 2012

Dear All,

For baseline exterior lighting power, ASHRAE 90.1 instructs us to accept 
0.2 W/ft2 for each illuminated wall or surface.

If we have a glass curtain walled office building with lighting provided 
by luminaires mounted on facade spandrels, what is the definition of 
illuminated wall? Spandrels + glass, or just spandrels?


Omer Moltay

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