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Light is measured in lux units. One lux is equal to one lumen per square metre.
A lumen is a measurement of visible light. The higher the lumen the brighter the light.View Infographic
A watt is a unit of power used to measure the rate of energy transfer. One watt is reached when one amp crosses the potential electrical current of one volt.
Commonly used in the United States a foot candle is another measurement of visible light. One foot candle is equal to one lumen per square foot.
Illuminance is the amount of luminous flux emitted by a light.
Using a device called a lux meter, or download a lux meter app, which will give a rough guide of how much light is being emitted.
A light plot shows the spread of light for the total number of lamp heads. Each band represents a different number of lux.
*Top tip* Keep an eye on the distance that the light reaches.