An instrument for measuring the luminance, luminous intensity, or illuminance of a light source. Analogous to radiometer, but with an output weighted by the wavelength response of the human eye (i.e., [..]

An instrument that measures the intensity of light. Astronomers use photometers to measure the brightness of celestial objects.

An instrument used to measure the intensity of light.…

n. Any instrument for measuring the intensity of light or comparing the intensity of two lights.

An instrument that measures the intensity of light. Astronomers use photometers to measure the brightness of celestial objects.

In astronomy, an instrument to measure the amount of light that reaches the telescope.

a tool which gauges the severity of light, taking into consideration the vulnerability of the human visual system to light of varying wavelengths. This measurement is varied from that of the amount of [..]

An instrument comparing the intensity source with that of a standard source.

(n) measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source(n) photographic equipment that measures the intensity o [..]

An instrument used for measuring luminous intensity, luminous flux, illumination or brightness.

An instrument for measuring luminous intensity, luminous flux, illumination, or intensity. See also Correlated Noise.

instrument for measuring light being reflected from a surface. It works by comparing the reflected light with a standard source produced within the photometer.

an instrument that measures illuminance

An instrument that measures light emitted by an object.

An optical instrument that measures the intensity of light from a source.

An instrument that measures the intensity of light. Astronomers use photometers to measure the brightness of celestial objects.

Any of a number of atmospheric phenomena which appear as luminous patterns in the sky. They do not directly cause adverse weather. They include halos, coronas. rainbows, and fogbows.

Any of a number of atmospheric

Any of a number of atmospheric phenomena which appear as luminous patterns in the sky. They do not directly cause adverse weather. They include halos, coronas. rainbows, and fogbows.