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Sagot :
Option D: John will express his brightness unit in candela.
HOW IS THE BRIGHTNESS OF A LIGHT MEASURED?
Power, or the rate at which energy is utilized or produced over time, is measured in watts. Energy providers utilize watts to calculate the amount of electricity we use in Kilowatts per Hour (kWh), which is equivalent to 1,000 watts used for one hour.
A fundamental unit of measurement for the amount of visible light that a light source emits is called a lumen (lm), also known as luminous flux.
Simply put, to assess the power of a lamp inside a lighting fixture, look for the total number of Lumens.
SUCCESS FOR LUMINAIRE
In addition to the light itself, a number of other elements must be considered when estimating the amount of light that is emitted. Most lamps are housed in a light fixture that is composed of diffusers and reflectors, among other parts.
These variables, along with others like the shape and number of lights, will affect the luminaire’s brightness and light dispersion.
Luminaire efficacy considers these factors to give a more accurate estimation of the lumens generated by the entire luminaire once it is fully constructed.
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