Luminous intensity

In photometry, l' luminous intensity is a measurement of the glare perceived by the human eye of a source of light. The unit IF of the luminous intensity is the Candela (symbol Cd).

The human eye is sensitive only at one small portion of the electromagnetic Specter (the visible field) and does not have the same sensitivity to different the wavelengths to which it is sensitive. In a luminous environment (vision diurnal, known as photopic), the human eye is most sensitive to the field wavelength corresponds to the perception of the yellow-green, that is to say 555 Nanomètre S. Ainsi, two sources of light of the same energy power in Radiométrie (not to confuse with the power luminous) and located at equal distance from an observer inevitably do not have the same luminous intensity in photometry. A monochromatic source radiating in the yellow-green will have an luminous intensity higher than another radiant in the red or blue.

See too

• spectral Apparent brightness
• luminous Flow

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