Illuminance Photometers & Colorimeters
The tool without which no photometry lab is complete! The illuminance meter - popularly known as the "lux meter" - records the level of illuminance from a light source; illuminance is the luminous flux per unit area received at a surface measured in lumens per square meter or lux. Illuminance varies with the distance from the light source. An illuminance meter is often equipped with a cosine diffuser which scales the effective illuminance from light sources that illuminate at angles other than normal incidence. An illuminance meter can also double as a tristimulus response colorimeter for measuring the chromaticity and colour temperature of the light source. If you need to measure illuminance or colour uniformity (for example, from projectors, car headlights or LED luminaires), you may wish to consider an imaging photometer. For the highest accuracy and for colour rendering measurements, you should consider a spectroradiometer.
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