• PMA 2131 SCOTOPIC LIGHT DETECTOR Sensors_PMA2131-.pdf
The spectral response of the human eye changes with light intensity. The eye has two distinctive spectral responses, which are defined according to the brightness of the light entering the eye. The first spectral response of the eye occurs under typical daytime lighting conditions (photopic) defined for light intensity greater than 0.1 Lux. The second spectral response occurs under low light conditions (scotopic) defined for light intensity between 0.01 and 0.0001 Lux. Light intensity less than 0.0001 Lux is undetectable by the human eye. The eye's shift from the photopic response to the scotopic response is know as the Purkinje shift. The scotopic spectral luminous efficiency curve peaks at 507 nm and it is normalized to 1 at that wavelength.
PMA Series capabilities and applications app112.pdf