Everything about Luminous Intensity totally explained
In
photometry,
luminous intensity is a measure of the wavelength-weighted
power emitted by a
light source in a particular direction, based on the
luminosity function, a standardized model of the sensitivity of the human eye. The
SI unit of luminous intensity is the
candela (cd), an
SI base unit.
Photometry deals with the measurement of visible light as perceived by human eyes. The
human eye can only see light in the
visible spectrum and has different sensitivities to
light of different wavelengths within the spectrum. When adapted for bright conditions (
photopic vision), the eye is most sensitive to greenish-yellow light at 555 nm. Light with the same
radiant intensity at other wavelengths has a lower luminous intensity. The curve which measures the response of the human eye to light is a defined standard, known as the
luminosity function. This curve, denoted
or
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