22 August 2006
Philip Burton Federal Building6 7. This lighting control retrofit project
incorporated advanced lighting controls and daylight sensors for 16,720 m2 (180,000
square feet) of the 20-story Philip Burton Federal Building in San Francisco. When
adequate daylight entered the space, unnecessary lighting was turned off. Energy
savings ranged from 30% to 41% for zones of luminaires nearest the windows and 16%
to 22% for interior zones of luminaires. Using this type of control equipment, the
payback for equipment ranges from 4.7 to 6.4 years.
California State Automobile Association8. In this renovation, skylights with
automatic louvers control the amount of light entering the building based on the amount
of available daylight. Barometric exhaust vents in these skylights release heat gain
from the skylight wells. Dimmable electronic ballasts raise and lower the electric lighting
based on the amount of light in the space. High performance windows and manual
shades were also utilized. Overall lighting energy use was reduced by 32% with these
If the majority
of areas are daylighted, then the
electric lighting becomes supplemental during daytime periods. Since our appetite for
light is less in the evening and nighttime hours, daylighting does not need to be
duplicated with electric lighting. Design electric lighting to supplement the daylighting.
For example, when daylight is plentiful, the electric lighting could be dimmed near the
daylight source. In other areas where the daylight penetration is not as great, the
electric lighting can be increased. Electric lighting controls (daylight and occupancy
sensors) can typically save up to 50% of the lighting energy in existing buildings and up
to 35% in new buildings9.
Electric lighting must be dimmed, switched, or controlled in response to
daylight availability. Do not attempt to duplicate daylight with electric light
Commission controls to maximize and tune energy benefit.
"Philip Burton Federal Building", Pacific Gas and Electric Company, Daylighting Initiative, 1999,
Rubinstein, Francis; Jennings, Judith; Avery, Douglas; "Preliminary Results from an Advanced Lighting
Controls Testbed", Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA, March 1998
"California State Automobile Association Office", Pacific Gas and Electric Company, Daylighting
New Buildings Institute, Inc. "Lighting Controls", Advanced Lighting Guidelines, Chapter 8. 2001 Edition,