A theater manager is selecting lamps for stage lighting, aiming to minimize both heat generation and maintenance costs. Considering lamp disadvantages, which type of lamp should NOT be used to achieve these goals?
Incandescent lamp
The selection principle here is efficiency of light production: a lamp that turns a large share of its input into heat both raises the cooling load and, through a hot filament, tends to fail sooner and cost more to maintain.
An incandescent lamp produces light only by heating a tungsten filament until it glows, so the great majority of the energy leaves as heat rather than light, and the constantly stressed filament gives a short service life.
That combination is exactly what the theatre wants to avoid, since it means high stage heat and frequent lamp changes at height, driving up maintenance cost.
An LED lamp converts most of its energy to light, runs comparatively cool and lasts for many thousands of hours, so it is the opposite of what should be avoided.
A fluorescent lamp is also far more efficient and longer-lived than an incandescent, generating much less heat per unit of light.
A halogen lamp does run hot but still outlasts and outperforms a plain incandescent; among the four, the incandescent is the clear worst for heat and maintenance.
Hence, the answer is Incandescent lamp.
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Important Questions from Illumination
Which of the following best describes a LASER light?
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Which of the following statements regarding the absorption factor in lighting purposes is correct?
How many 200 linear lamps are required to obtain a minimum illuminance of 50 lux in a 5 m and 8 m rectangular hall?
