Light Intensity Meter

Illuminance is the metric that is used to measure the light intensity within a space.

Light intensity meter. So one lux is one lumen per square meter this relating brightness to distance from the source. These meters are ce marked so they meet european safety standards. Some meters also have an analog output which transmits data to a recorder. Amazon s choice for light intensity meter btmeter bt 881d digital illuminance light meter measure lights 0 01 400 000 lux 0 01 40 000 fc foot candles luxmeter with 270º rotated sensor for plants led lights indoor outdoor light tester.

Illuminance is measured by luxmeters on the lux scale. 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. After using the joly photometer to measure comparative light intensities you can measure light intensity using an analog or digital light meter. 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.

However what matters most in terms of measuring light intensity is the number of lumens falling on a surface which is expressed as lux. In photography a light meter more correctly an exposure meter is used to determine the proper exposure for a photograph. Measure light quality and intensity with these meters. 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.

The solarmeter model 9 6 red light meter measures red light from 577 661nm. Summarizing while light output is expressed in lumens light intensity is measured in terms of lumens per square meter or lux. They should not be used with lasers. 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.

While a photometer is sometimes called a light meter there are distinctions between these devices. 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. Use the data hold function to freeze a measurement on the screen giving you time to write it down. One candela per steradian is termed a lumen which is the measure of light intensity people are most familiar with.

Therefore light intensity is measured in terms of lumens per square foot footcandles or lumens per square meter lux. 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. Light intensity lux meters.