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2. Photometer - Wikipedia

   en.wikipedia.org/wiki/Photometer

   As the illumination of different parts of the picture varies, advanced photometers measure the light intensity in different parts of the potential picture and use an algorithm to determine the most suitable exposure for the final picture, adapting the algorithm to the type of picture intended (see Metering mode).

3. Light meter - Wikipedia

   en.wikipedia.org/wiki/Light_meter

   Use of a light meter for portrait cinematography in a Turkish music video set. A light meter (or illuminometer) is a device used to measure the amount of light.In photography, an exposure meter is a light meter coupled to either a digital or analog calculator which displays the correct shutter speed and f-number for optimum exposure, given a certain lighting situation and film speed.

4. Light intensity - Wikipedia

   en.wikipedia.org/wiki/Light_intensity

   Several measures of light are commonly known as intensity: Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr) Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd) Irradiance, a radiometric quantity, measured in watts per square meter (W/m 2)

5. List of astronomical instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_astronomical...

   Spectrometers: used to measure spectral components of light; Sundial: device that tells the time of day by the apparent position of the Sun in the sky; Transit instrument: small telescope used for precise astrometry; Telescope: instrument that makes distant objects appear magnified

6. Spectrophotometry - Wikipedia

   en.wikipedia.org/wiki/Spectrophotometry

   Spectrophotometry uses photometers, known as spectrophotometers, that can measure the intensity of a light beam at different wavelengths. Although spectrophotometry is most commonly applied to ultraviolet, visible , and infrared radiation, modern spectrophotometers can interrogate wide swaths of the electromagnetic spectrum , including x-ray ...

7. Luminous intensity - Wikipedia

   en.wikipedia.org/wiki/Luminous_intensity

   Luminous intensity is the perceived power per unit solid angle. If a lamp has a 1 lumen bulb and the optics of the lamp are set up to focus the light evenly into a 1 steradian beam, then the beam would have a luminous intensity of 1 candela. If the optics were changed to concentrate the beam into 1/2 steradian then the source would have a ...