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Name the four characteristics of
incandescent lamp operation.
EFFICACY
LUMEN MAINTENANCE
MORTALITY
COLOUR RENDERING
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Lamp efficacy is measured in lumens
per watt, which is important because it affects the
OPERATING COST of lighting.
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From the data in Buyers' Guide
calculate lamp efficacy for:
240V 150W gls lamp
2100/150=14 L/W
110V 150W gls lamp
2360/150=15.73 L/W
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Improving lamp ruggedness with
additional filament supports increases lamp efficacy.
True
X False
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Incandescent lamps have a colour
rendering index (Ra) of
100
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List five advantages of
incandescent lamps.
SIMPLE TO USE WIDE DESIGN FLEXIBILITY EASIEST TO DIM
IMMEDIATE STARTING
WIDE RANGE OF OUTPUT LEVELS
EXCELLENT OPTICAL CONTROL
LOWEST INITIAL COST
OPERATE OVER WIDE AMBIENT
TEMPERATURE RANGE
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Incandescent lamps are easily
dimmed, however, this means that they are sensitive to
VOLTAGE variations.
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