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A Macbeth illuminometer is a type of portable visual photometer in which the light to be measured is balanced by a Lummer-Brodhun sight box* against a comparison lamp, whose apparent brightness can be varied by moving it along a tube; a control box supplies a calibrated current to the comparison lamp, and calibrated optical filters can be placed in the light paths to correct for color differences in the comparison and measured sources and to extend the range of the instrument.

* A Lummer-Brodhun sight box is a device, having a series of prisms, for viewing simultaneously the two sides of a white diffuse plaster screen illuminated by light sources whose luminous intensities are being compared

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10y ago
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1mo ago

The Macbeth illuminometer measures illumination by quantifying the amount of light falling on a surface in foot-lamberts or lux units. It uses a sensor to detect light levels and provides a numerical readout of the intensity. This measurement is useful in assessing and controlling lighting conditions in various applications such as Photography, film production, and interior lighting design.

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Q: Explain the measurement of illumination using Macbeth illuminometer?
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