Light Intensity Meter Name

A light meter is a device used to measure the amount of light.

Light intensity meter name. Radiant intensity a radiometric quantity measured in watts per steradian w sr luminous intensity a photometric quantity measured in lumens per steradian lm sr or candela cd irradiance a radiometric quantity measured in watts per meter squared w m 2. Luminous intensity is measured in lumens per square meter lux or lx or lumens per square foot foot candles or ft c. Photometry is distinguished from radiometry in which each separate wavelength in the electromagnetic spectrum is detected and measured including the ultraviolet and infrared. A klux is a 1000 lux and about 1 1 klux is the minimum light requirements for any plants for at least 12 hours per day to gain any benefit from fertilization.

Newer digital light meters measure light intensity in lux while older analog light meters usually measure light intensity in an older unit called the foot candle defined as 1 lumen per square foot. The meter will include either a digital or analog calculator which displays the correct shutter speed and f number for optimum exposure given a certain lighting situation and film speed. Photometry is the science of the measurement of light intensity where light refers to the total integrated range of radiation to which the eye is sensitive. Similarly exposure meters are also used in the fields of cinematography and scenic design in order to determine the optimum light level for a scene.

Several measures of light are commonly known as intensity. In photography a light meter is used to determine the proper exposure for a photograph.