I have heard that Standard 90.1-2001 was amended to adopt the lighting power densities in Standard 90.1-2004, which are stricter. How is this addressed by the Commercial Buildings Deduction?

Standard 90.1-2001’s lighting power densities are essentially the same as Standard 90.1-1999, the national energy standard.

It is true that Addendum g to Standard 90.1-2001 changed the lighting power densities to values that are now adopted in Standard 90.1-2004. However, the Commercial Buildings Deduction recognizes Standard 90.1-2001 as in effect on April 2, 2003.

This means the original published lighting power densities in Tables 9.3.1.1 and 9.3.1.2 are in effect as far as the provision is concerned (and not the update to the 90.1-2004 lighting power densities).

However, be sure to comply with all state and local codes, in addition to following the applicable sections of Standard 90.1-2001, if your project triggers the application of these codes.

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