|
Types
of Lighting |
| Incandescent Provide most residential lighting Low efficiency 80% of the energy is lost as heat In 1992 consumed about 8% of all U.S. electricity Fluorescent 3-5 times as efficient as incandescent 10-20 times longer life as incandescent More expensive Frequent switching on and off decreases life Compact Fluorescent Invented in 1984 Many styles - two, four, six-tube, and circular lamps Energy Star CFLs use 66% less energy than an incandescent If in 1992 CFL’s had replaced ½ of all residential lighting supplied by incandescent bulbs, electricity consumption would have dropped 36 terrawatt hours per year (the combined annual output of 6 coal burning power plants) A GE 16 watt Spiral Compact Fluorescent has the same light quality as a 60-watt incandescent Can last 10 times longer than an incandescent. $30 savings by replacing a 100-watt incandescent with a 32-watt CFL Other High Intensity Discharge Lamps Low Pressure Sodium lamps Used for street lighting, and other areas where quality is not as important Task lighting Allows light to be focused in a specific area without wasting lighting in the general area Workspace specific lighting Can require fewer than ½ of the fixtures to light an office More control given Daylighting |
This page
was created by Sandra
Kaminskas '04 in
Environmental Studies 390, |