Question
Download Solution PDFThe ratio of luminous flux emitted by a lamp to the power consumed by the lamp is ______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLuminous efficacy or luminous efficiency:
- Luminous efficacy is a measure of how well a light source produces visible light.
- It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI).
- The power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source.
Flux or Luminous Flux:
It may be defined as "the rate of energy radiated in the form of lightwave by a luminous body". It is represented by ϕ or F and measured in lumen.
Luminous flux, F = (radiant energy) / time
Important Points
|
Quantity |
Unit |
|
Illumination |
Lux |
|
Luminous intensity |
Candela |
|
Luminance |
Candela per square metre |
|
Light |
Lumens-hours |
|
Luminous flux |
Lumens |
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