IWASAKI LIGHTING - EYE Lighting International of North America, Inc.

5
HALOGEN
GENERAL LIGHTING HALOGEN LAMPS
1. When the lamp is turned on, tungsten particles
evaporate from the � lament and attach to the
bulb wall. Simultaneously, halogen around the
high temperature � lament decomposes to
atomic halogen.
2. Atomic halogen is then di� used on the bulb wall
and combines with free tungsten particles to
become transparent and volatile tungsten halide.
Technical Information
Principle of Tungsten Halogen Regenerative Cycle Process
3. Due to the high temperature (Over 500° F)
on the bulb wall, tungsten halide is vaporized
and circulates back to the � lament.
4. After tungsten halide decomposes, halogen
gas is released, ready to combine again, and
tungsten is redeposited on the � lament,
whereby the process is ready to begin again.
Lumen Maintenance Curve Spectral Energy Distribution
Relative Luminous Flux (%)
110
100
90
80
70
60
0 20 40 60 80 100
Hour Life (%)
Expected Life v.s. Line Voltage
Survival (%)
100
80
60
40
20
0
0 20 40 60 80 100 120
Relative Life (%)
Halogen Lamp
Ordinary Incandescent Lamp
95% of rated line volts
Rated line volts
105% of rated line volts
Voltage Fluctuation Characteristics
of Halogen Lamps
This diagram shows average �gures of common characteristics of
halogen lamps. Figures may vary according to type of halogen lamp.
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Energy Distribution Ratio (%)
Color Temperature, Wattage, E�ciency, Lumen (%)
100
80
60
40
20
0 400 450 500 550 600 650 700
180
160
Life (h)
140
120
Color
100 Temperature
(K)
80
60
40
20 Power
Consumption (W)
0
Wave Length (nm)
Total Lumens (lm)
70 80 90 100 110 120
Voltage (%)
E�ciency
(lm/W)
300
200
Life (%)
100
0