Lighting Efficiency

The most important characteristic of a lamp, from an energy viewpoint, is its ability to convert electrical energy into light. This measure is referred to as efficacy, in lumens per watt or light output per watt input. The chart below shows the general range of lumens per watt for various light sources.

Category	Lumen/watt
Incandescent	10 to 35
Mercury Vapour (HID)	20 to 60
Light Emitting Diode	20 to 80+
Fluorescent	40 to 100
Metal Halide (HID)	50 to 110
High Pressure Sodium (HID)	50 to 140
Low Pressure Sodium	100 to 180

Lamp Efficacy or Efficiency

The efficacy of various types of lamps is shown below:

Lamp Type	(Lumens per Watt)	Rated Average Life (hours)
Incandescent	10 to 35	1,000 to 4,000
Mercury Vapour	20 to 60	24,000+
Light Emitting Diode	20 to 80+	30,000 to 100,000
Fluorescent	40 to 100	6,000 to 24,000
Metal Halide	50 to 110	6,000 to 20,000
High Pressure Sodium	50 to 140	24,000 to 40,000
Low Pressure Sodium	100 to 180	16,000

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