22 August 2006
Figure 5-7. Efficacy Comparison of Light Sources for General Lighting.
Ballast watts included for discharge lamps systems. Sunlight and daylight ranges
calculated inside of single pane clear glass and high performance glass.6
Compact Fluorescent Lamps. Compact fluorescent lamps (CFL) replace the
standard incandescent lamp. Because the CFL comes in a variety of wattages and
sizes, and gives off a "glow" of light, it is ideal for wall sconces, decorative pendants,
recessed wall washers, table lamps, torchieres, step lights, and exterior pedestrian
5-3.3.1 Select luminaires that are designed for the CFL complete with ballast, as
opposed to luminaires that are designed for the standard incandescent but will accept a
"screw in" type CFL replacement. Only use "screw in" replacements for a lighting retrofit
when the cost of replacing the equipment is prohibitive.
5-3.3.2 Low wattage CFL lamps (less than 13 watts) generally have a lower efficiency
and shorter lamp life than the CFL lamps of greater wattage. Also, use high wattage
CFLs (42 watt and above) in luminaires where the lamp brightness is hidden or
New Buildings Institute, Inc. "Light Sources and Ballast Systems", Advanced Lighting Guidelines,
Chapter 6. 2001 Edition, 6-3. Neither the sponsors, authors, editors, advisors, publisher, or the New
Buildings Institute, Inc. nor any of its employees make any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness or usefulness of any data, information,
method, product or process disclosed in this document, or represents that its use will not infringe any
privately-owned rights, including but not limited to, patents, trademarks or copyrights. 2001 by New
Buildings Institute, Inc. All rights reserved.