What is the difference between a goniophotometer and an integrating sphere in luminous flux test?

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Both a goniophotometer and an integrating sphere are examples of optical measuring tools that are used in the process of evaluating the functionality of light sources like LED lights. The manner in which these two devices assess the amount of light produced is the primary distinction between them.

By using a motorized arm that moves the detector around the source, a goniophotometer is able to measure the light output of a source from a variety of various angles. It offers a comprehensive angular distribution of the light output, which is helpful for defining the pattern of light emission coming from a source.

An integrating sphere, on the other hand, collects the light that is released by a source and then distributes it uniformly throughout its interior surface in order to calculate the total quantity of light that the source emits. After that, the light is measured at a single location, often via a tiny aperture in the sphere, and this provides an overall measurement of the entire light output, also known as the luminous flux, of the source. This measurement is helpful for measuring the overall brightness of a source; however, it does not offer information regarding the pattern of light emission that the source produces.

To summarize, a goniophotometer is good for measuring the pattern of light emitted by a source, whilst an integrating sphere is useful for measuring the overall amount of light emitted by a source. Both instruments may be found in a light measurement kit.

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