ASHRAE 90.1-2004

Section: 9.1.3 - Installed Interior Lighting Power

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The installed interior lighting power shall include all power used by the luminaires, including lamps, ballasts, current regulators, and control devices except as specifically exempted in 9.2.2.3.

Exceptions:

If two or more independently operating lighting systems in a space are capable of being controlled to prevent simultaneous user operation, the installed interior lighting power shall be based solely on the lighting system with the highest wattage.