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Characteristics and Efficiency

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Home > Characteristics and Efficiency of Different Light Sources

The performance and features of a light source needs to be matched to the lighting task being performed. In order to select the

right light source for the job, you should consider important performance variables such as light output (Lumens), efficiency

(Lumens/Watt technically referred to as efficacy), lamp life, and color rendering properties measured in terms of the Color

Rendering Index (CRI). The CRI is a measure of the degree to which a light source renders colors that are close to true color. For

practical purposes it is a number from 0 to 100; the higher the number, the closer to true color. The efficiencies of each type of light

source can vary dramatically, so the choice of light source can have a dramatic impact on lighting energy costs. The performance

characteristics and efficiencies of common light sources are shown in the table and chart below.

Characteristics and Efficiency of Different Light Sources

Characteristics of Common Light Sources

Light Source

Eff ic iency Average Lamp L if e Color

( Lu me ns /Wa tt ) ( Ho ur s) R en de ri ng I nd ex

Standard Incandescent 5-20 750-1000 100

Tungsten-Halogen 15-25 2000-4000 100

Compact Fluorescent 20-55 10,000 80

T ub ul ar Fl uo re sc en t 6 0- 10 0 1 5,0 00 -24 ,00 0 5 0- 90

Mercury Vapor 25-50 Up to 24,000 15-30

Metal Halide 45-100 10,000-20,000 60-90

Hi gh Pressure Sodium 45 -110 Up to 24,000 9 -70

Cost Comparison of Incandescent and Fluorescent Lamps

Lamp Type Energy Costs First Cost Maintenance Costs

Incandescent Much Higher Lower Higher

Fluorescent Much Lower Higher Lower

The Comparison of different Lamp Sources

LAMP COMPARISON CHART *

WATTS LUMENS LUMEN / WATT min.START TEMP. STARTUP TIME RESTRIKE TIME AVG. LIFETIME COLOR TEMP.

INCANDESCENT

40w 480 12 -40 instant instant 1000 h 2700k


75w 1,200 16 -40 instant instant 1000 h 2700k



TUNGSTEN HALOGEN




LED (white)

0.03-5w 18-115 -40 instant instant50,000 -

100,000 h2700-10,000k

COMPACT FLUORESCENT

PL13w 1,050 81 -20 .5 to 5 sec. 1 sec. 10,000 h 2700-6500k

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LED Lamps & Systems | LED Luminaires-indoor | LED Luminaires-outdoor, Udeman Lighting

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QUAD 28w 1,500 57 0 .5 to 5 sec. 1 sec. 10,000 h 2700-6500k

CF26w 1,800 69 -20 .5 to 5 sec. 1 sec. 10,000 h 2700-6500k

CF32w 2,400 75 -20 .5 to 5 sec. 1 sec. 10,000 h 2700-6500k

CF42w 3,200 76 -20 .5 to 5 sec. 1 sec. 10,000 h 2700-6500k

METAL HALIDE

50w 3,500 70 -20 2-5 min. 10-20 min. 5,000 h 4000k

70w 5,000 71 -20 2-5 min. 10-20 min. 7,500 h 4000k

100w 8,500 85 -20 2-5 min. 10-20 min. 15,000 h 4000k

150w 13,000 87 -20 2-5 min. 10-20 min. 15,000 h 4000k

175w 14,000 80 -20 2-5 min. 10-20 min. 10,000 h 4000k

250w 20,500 82 -20 2-5 min. 10-20 min. 10,000 h 4000k

LOW PRESSURE SODIUM

18w 1,800 100 -20 7-10 min. 3-12 sec. 18,000 h 1700k

35w 4,800 137 -20 7-10 min. 3-12 sec. 18,000 h 1700k

55w 7,800 142 -20 7-10 min. 3-12 sec. 16,000 h 1700k

HIGH PRESSURE SODIUM

50w 4,000 80 -40 3-4 min. 1 min. 24,000 h 2200k70w 6,300 90 -40 3-4 min. 1 min. 24,000 h 2200k

100w 9,500 95 -40 3-4 min. 1 min. 24,000 h 2200k

150w 16,000 107 -40 3-4 min. 1 min. 24,000 h 2200k

250w 30,000 120 -40 3-4 min. 1 min. 24,000 h 2200k

MERCURY VAPOR

50w 1,580 32 -30 5-7 min. 3-6 min. 24,000 h 3200-7000k

75w 2,800 37 -30 5-7 min. 3-6 min. 24,000 h 3200-7000k

100w 4,100 41 -30 5-7 min. 3-6 min. 24,000 h 3200-7000k

175w 7,900 45 -30 5-7 min. 3-6 min. 24,000 h 3200-7000k

250w 12,100 48 -30 5-7 min. 3-6 min. 24,000 h 3200-7000k

INDUCTION LAMP

55w 3,500 64 -40 .5 to 5 sec. .5 to 1 sec. 100,000 h 3000k

85w 6,000 70 -40 .5 to 5 sec. .5 to 1 sec. 100,000 h 3000k

165w 12,000 72 -40 .5 to 5 sec. .5 to 1 sec. 100,000 h 3000k

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