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Incandescent Lamp Advantages
Incandescent lamps offer a number
of advantages:
-
Simple to use -
direct connection into socket.
-
Lowest initial lamp
cost.
-
Immediate starting
and re-starting - no warm-up or
cool down required.
-
Excellent optical
control - concentrated light
source is easiest to direct or
focus.
-
Easiest to dim -
simple variable resistor
circuitry may be all that is
required.
-
Wide design
flexibility - variety of styles,
outputs, and colours fill nearly
every need.
-
Output not affected
by operation over a wide range
of ambient temperature.
-
Available in
wattage ratings from 10 to 100W.
Incandescent Lamp
Disadvantages
-
Sensitive to shock
and vibration - use ROUGH or
VIBRATION SERVICE lamps or
special sockets in high shock or
vibration environments.
-
High overall
operating cost - low efficacy
and short life.
-
Sensitive to
voltage variations. See figure
4.17.
Operating 240V lamp
on 226V (-6%) reduces wattage by
10%, reduces light output by 20%
and increases lamp life by 30%.
Operating 240V lamp on 254V (+6%)
increases wattage by 10%,increases
light output by 22% and decreases
lamp life by 30%
Note: ±6% is the tolerance to which
the electrical supply companies
operate in UK.
-
Sensitive
to thermal shock - high
bulb surface temperature
requires that the lamp
be protected from
moisture. Exceptions are
hard glass bulbs and low
wattage lamps (less than
l0W).
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Lowest
efficacy - all other
lamp types surpass
incandescent performance
by a large margin.
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