Lighting requirements of Ashrae 90.1-2007

Gahl, As far as LEED and ASHRAE are concerned, you can't exceed the requirements. However, you DO have some options. First, consider installing occupancy sensors, Table G3.2 allows you to claim a 10% Lighting power density reduction for all areas with occupancy sensors. Similarly, you can install daylighting sensors and cut off switches to lower the amount of energy used by your system. However, your first step needs to be education, 50 fc in an office environment is wasteful and unnecessary. You might also consider fixture placement to maintain 50 fc over work surfaces, but have darker areas on open space. Hope this helps, Paul

On existing CI fixtures which exceed the LPD, but were daylite and occupancy sensors are installed, disconneting some fixtures that do not not have an impact on the work surfaces FC might get you there in combination with the 10%. Its worth a trial run on a CI project that has already fixtures installed by the landlord.