22 August 2006
in mind that all of these additional advantages are only achieved when the optimized
ballast is paired with the high performance lamp. These ballasts are not available as
dimming, only as instant start. A premium lamp can be used on a dimming ballast, but it
will not have the lamp life benefit. On a dimming, or any non-optimized, ballast, the
lamp will have an average of 20,000 to 24,000 hours. See the section on ballasts for
additional information. Refer to the controls section for compatible devices with various
Requirements for linear fluorescent lamps:
Use electronic or electronic dimming ballasts for all linear fluorescents.
Do not mix linear fluorescent lamp color temperatures within a single
building to minimize maintenance and the chance of visual confusion.
T12 lamps are prohibited. (The Energy Policy Act of 1992 ended
production of many of these lamps.)
Considerations for linear fluorescent lamps:
Use 3500K and 75+ CRI as the default color temperature and color
Use 3000K in housing and hospitality applications. Use 3500K in all other
applications except for maintenance facilities where 4000K may be used.
Consider T8, T5HO, and High Performance T8 lamps based on the
application, initial cost, and potential energy savings.
Induction Lamps. Induction lamps are essentially fluorescent lamps without
electrodes. Therefore, they have very high efficiencies and extremely long lives
(70,000-100,000 hours). Induction lamps have many of the fluorescent lamp
advantages such as superior color rendering, instant on/off switching, and long life.
5-3.5.1 Despite the high initial cost, these lamps offer significant cost benefits
regarding low energy and maintenance costs. Because a typical relamping schedule
may call for changing metal halide lamps after only 15,000 hours, while induction lamps
can be changed after 60,000 hours, the savings in lamp replacements and labor costs
quickly pays for the higher installation cost. In some cases, the payback period may be
as short as 5-7 years. Most importantly, the induction lamp is extremely reliable. When
compared against higher wattage HPS lamps, the energy savings of the induction lamp
reduces the payback period even more.
5-3.5.2 The ideal application for induction lamps is in areas where metal halide or
high-pressure sodium lamps may be used, even though the induction lamp is larger.
Long life and instant on/off induction lamp characteristics make it very reliable and easy
to control with motion sensors.