22 August 2006
Linear Fluorescent. Select ballasts for linear fluorescent lamps that operate
ballasts with a high ballast factor (greater than 0.95). Provide programmed start
ballasts for T5 and T5HO lamps that include end of life protection.
5-4.2.1 Instant Start fluorescent ballasts have the advantage of lower input wattages.
However, if the lamps are switched frequently, the instant start will decrease the life of
the lamp. Therefore, the energy savings is only a benefit in applications where the
lamps will be turned on and left on for a long period of time. These must not be used in
applications where individual occupants have control over the lighting or with automatic
controls such as daylight and occupancy sensors.
5-4.2.2 Rapid Start fluorescent ballasts start the lamp in a softer manner that takes a
few seconds to turn on, but does not decrease the life of the lamp with frequent
switching. They do not have the same energy benefit as instant start ballasts.
5-4.2.3 Programmed Start fluorescent ballasts delay the heating of the lamp when it
is started. This ballast increases the lamp life and also operates the lamp at a slightly
lower input wattage than rapid start ballasts. However, the input wattage is slightly
higher than instant start ballasts. Some manufacturers are discontinuing the rapid start
ballast and replacing them with programmed start. Use Programmed Start fluorescent
ballasts in areas controlled with occupancy sensors.
Compact Fluorescent. Select ballasts for compact fluorescent lamps that
operate with a high power factor (greater than 90%). Provide programmed start ballasts
for compact fluorescent lamps that include end of life protection.
High Intensity Discharge. Provide HID ballasts with a high power factor
(minimum of 90%). Provide electronic metal halide ballasts for 150 watt and lower.
These ballasts are more reliable and use less energy than magnetic ballasts. Currently
they are only available for 150 watt lamps and lower. If higher wattages become
available from (3) manufacturers, they should be considered.
generator and a power coupler. The overall operating system should include a five-year
Light Emitting Diodes (LED). LED power supplies convert an input voltage to
low voltage DC output. One power supply module may operate multiple LED
luminaires. Dimmable power supplies are available.
Noise. Electromagnetic (core and coil) ballasts operate with a "hum" while
electronic ballasts produce little or no noise. Provide ballasts with a Class A noise
Flicker. HID lamp sources will flicker due to the changes in line voltage. This