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Light intensity meter.
While a photometer is sometimes called a light meter there are distinctions between these devices.
Illuminance is measured by luxmeters on the lux scale.
They shut off automatically to preserve battery life.
These meters are ce marked so they meet european safety standards.
So one lux is one lumen per square meter this relating brightness to distance from the source.
Whereas a photometer measures the intensity of light that passes through a solution a light meter measures the amount of ambient or reflected light in a given environment.
However what matters most in terms of measuring light intensity is the number of lumens falling on a surface which is expressed as lux.
After using the joly photometer to measure comparative light intensities you can measure light intensity using an analog or digital light meter.
Light intensity lux meters.
Situations needing light measurement photography studio the main reasons for measuring light intensity are to ensure that minimum standards of illumination are being met and to determine appropriate exposure times in photography and cinematography.
The solarmeter model 9 6 red light meter measures red light from 577 661nm.
Some meters also have an analog output which transmits data to a recorder.
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.
Luminous intensity is measured in lumens per square meter lux or lx or lumens per square foot foot candles or ft c.
A photometer and a light meter are instruments for measuring luminance the intensity of light.
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.
Applications include monitoring standard red light fluorescent lamp collagen stimulation lamp and wound healing lamp intensity and aging as well as testing outdoor red light and measuring red band photosynthetically.
They should not be used with lasers.
A light meter is a device used to measure the amount of light.
In photography a light meter more correctly an exposure meter is used to determine the proper exposure for a photograph.
Summarizing while light output is expressed in lumens light intensity is measured in terms of lumens per square meter or lux.
It is measured in footcandles or lux it is the amount of light lumens falling on a surface over any given square foot or square meter.
Therefore light intensity is measured in terms of lumens per square foot footcandles or lumens per square meter lux.
One candela per steradian is termed a lumen which is the measure of light intensity people are most familiar with.
