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.
Similar Questions
While planning lighting for a machine assembly area, an engineer calculates the required number of luminaires. If the area is 60 square meters and the recommended illumination level is 300 lux, what is the total luminous flux required for the area?
A theater lighting designer must ensure that each part of the stage receives the same amount of illumination from overhead lights. If the distance between the lights and the stage is doubled, which action will maintain equal illumination across all areas, according to the laws of illumination?
An industrial workshop requires 300 lux of uniform illumination on workbenches. The area to be illuminated is 120 square meters. If the utilization factor is 0.7 and the maintenance factor is 0.8, what should be the total luminous flux provided by the lighting installation?
Which of the following statements describes a difference between incandescent lamps and fluorescent lamps used in illumination?
Intensity of light is measured in:
Important Questions from Illumination
Silicon solar cell has an open circuit voltage NOT equivalent to-
What is the primary function of a choke in a tube light circuit?
Light is produced in electric discharge lamps by
________ lamps consist of an inner discharge tube and an outer evacuated tube.
A mercury vapor lamp gives ______ light.
