What Is Photometry?
Photometry is the measurement of visible light as perceived by the human eye. Photometry is a name formed by combining the words photo and metry. Photo is a prefix meaning light. Metry refers to the process of measurement.
Photometry is the measurement of visible light as perceived by the human eye. The human eye responds to wavelengths of light in the electromagnetic spectrum ranging from 360 to 800 nm. Photometry is a measurement method that mimics the way the human eye perceives light brightness.
Photometry is a name formed by combining the words photo and metry. Photo is a prefix meaning light. Metry refers to the process of measurement.
The human eye is made up of cones and rods that react to light in different ways. This causes light sources of the same brightness to appear brighter or dimmer depending on the wavelength or color of the light. For example, the human eye reacts strongly to the color green. It is less sensitive to extreme colors such as red and violet.
When the light source is not controlled, it can emit visible light in all directions. This results in unnecessary and uncomfortable lighting. The science of photometry attempts to control light by determining the intensity of light radiation.
Radiometry is the science of measuring light in any part of the electromagnetic spectrum. Radiometry measures the ultraviolet, infrared and visible spectrum. Radiometry measures the intensity of light in watts per square meter.
Photometry is a branch of radiometry and measures the spectrum of visible light in the range 360 to 800 nm, which is only perceived by the human eye. Photometry measures light in lumens (lux) per square meter.
A comprehensive laboratory test must be performed to analyze the various components of the light distribution. Two instruments, the integrating sphere and the goniophotometer, are used to measure photometric data. The integrating sphere can measure the luminous flux and color properties of a light source. The goniophotometer measures the angular distribution of light.
Photometry is the science behind the measurement of light. It should be confused with radiometry, which refers to the measurement of radiant energy. Photometry is an extremely complex subject due to the non-linear response of the human eye to light.
It is necessary to take into account the photometric properties of lighting fixtures when designing lighting. Photometric analysis in residential, commercial, industrial and public space lighting makes it possible to control costs and reduce energy consumption in addition to providing visual comfort.