I have a renovation project where there are three rooms in which we are not replacing the light fixtures. ASHRAE 90.1 Section 9.1.1 states, "..lighting requirements for existing building are triggered only when 50% or more of the existing luminaires in a space are replaced. A renovation that replaces less than 50% of the existing luminaires in a space is not required to comply with the standard unless it increases lighting power."
Does this mean I do not have to include these existing fixtures in the interior connected lighting power calculations?
Susann Geithner
PrincipalEmerald Built Environments
1297 thumbs up
August 17, 2011 - 10:49 am
You would excluded a room's lighting power, in which less than 50% of the lighting gets replace. However if you also go for credit EA 1.2 lighting control than you will have to still included it into the total lighting power.