A device that measures the amount of light is known as lux meter. If you want to calculate or know the amount of light falling on an object, then this device comes to the rescue. It properly gauges the intensity of light. Thismeter captures the intensity of the light within an environment for any given distance or area from the light sources.
The unit of measurement of light is lux and hence the devices measuring the intensity of light are named as lux meters. SI unit of lux is lx and the unit of lux is also known as illuminance.