Fluorescent bulbs produce as much as five times
the amount of light per watt of energy used than
incandescent or tungsten-halogen sources. They are
approximately five times more energy-efficient. They
also have a rated life from 10 times to 20 times that of
Compact fluorescent lamps (CfLs)
are small fluorescent bulbs that are
being used increasingly in all types of
lighting fixtures, including chandeliers,
wall sconces, surface mounted fixtures,
recessed lighting and track lighting. CFL
bulbs with a screw-in type of base can
be used to replace incandescent lamps in
standard lamp sockets.
T8 bulbs with electronic ballasts are commonly used
in larger ceiling fixtures. These bulbs are extremely
efficient, and because of the electronic ballast, the
fixtures turn on instantly and do not hum.
These bulbs have been common in commercial
projects, and are now being used widely in residential
installations. They are available in a wide range of color
tones, from warm to neutral to cool.
High-intensity discharge (HId) bulbs have a longer
life and provide more light (lumens) per watt than
any other light source. There are four different types
of HID bulbs: mercury, metal halide, high pressure
sodium and low-pressure sodium. HID bulbs are
mostly used in commercial and non-residential
applications. They are sometimes used in residential
applications for outdoor security and area lighting.