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Lighting Facts


Light Source

Average Life
(Hours)

Lumens
per Watt

Incandescent

750-2500

10-20

Tungsten-Halogen

1000-3500

18-22

Self Ballasted Mercury Vapor

12000-16000

25-33

Mercury Vapor

24000

40-63

Fluorescent

7500-24000

60-110

Metal Halide

7500-24000

85-110

High Pressure Sodium

24000

80-140

Low Pressure Sodium

12000-18000

100-200



 

Some Additional Lighting Facts

  • One gallon of #6 fuel oil is required to produce 15 kilowatt-hours of electricity. This amount of power would be consumed by 150 100-watt incandescent lamps operating for one hour.
  • One watt of air conditioning is required to offset the heat of one watt of light. Thus energy-saving lamps reduce air conditioning cost watt-for-watt.
  • Fluorescent lamps produce approximately five times the light of standard incandescent lamps -- watt-for-watt. Interesting Lighting Facts - Light Bulb
  • High pressure sodium lamps produce more than twice the light of mercury vapor lamps -- watt-for-watt.
  • Low pressure sodium lamps are the most energy-efficient of all lamps, producing approximately three times the light of mercury vapor lamps -
    watt-for-watt.