In photography a light meter is used to determine the proper exposure for a photograph.
Light intensity meter name.
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 majority of light meters used around the world have the konica minolta name on them.
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.
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.
A light meter is a device used to measure the amount of light.
After using the joly photometer to measure comparative light intensities you can measure light intensity using an analog or digital light meter.
Several measures of light are commonly known as intensity.
Luminous intensity is measured in lumens per square meter lux or lx or lumens per square foot foot candles or ft c.
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.
Photometry is distinguished from radiometry in which each separate wavelength in the electromagnetic spectrum is detected and measured including the ultraviolet and infrared.