A scientist setting up a lamp for testing in the 2m integrating sphere
The integrating sphere is used to quickly measure the total light output (luminous flux) of a lamp. It is used for a variety of optical, photometric or radiometric measurements.
The lamp being tested is placed in the center of the integrating sphere. At one side of the sphere is a light meter which measures the light output of the lamp. Between the lamp and the light meter there is a baffle to prevent the meter from seeing any direct light from the lamp.
The inside of the sphere (including the baffle) is coated with a very white paint that reflects all wavelengths equally. This allows to get very accurate measurements. The light from the lamp bounces around the sphere until it reaches the light meter.
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