Luminosity refers to the total amount of light being given off by a source, regardless of the direction.
- The luminosity of a light source depends on the total amount of power it consumes and the efficiency with which it converts that power into visible light.
- Luminosity is a measurable quantity and is often used as an objective measure of the total amount of light being emitted by a source.
- So luminosity refers to the total amount of light emitted by a source per unit time and is often measured in units like watts or lumens. It indicates the raw power of the light source, regardless of its colour or direction.
- The maximum luminosity of a display device corresponds with the brightest white it can reproduce and is called the white point.
- The black point corresponds with the minimum luminosity of a device, so corresponds with the device being turned off.
- The contrast ratio of the maximum and minimum luminosity of a television or computer screen is typically more than 280:1.