This node contains a table of
data for relative
sensitivity of the human
eye to various
wavelengths of
light.
Wavelengths are in
nanometers, sensitivities are relative to the
eye's peak
sensitivity at 555
nm.
- 400nm - 0.0004
- 410nm - 0.0012
- 420nm - 0.0040
- 430nm - 0.0116
- 440nm - 0.023
- 450nm - 0.038
- 460nm - 0.060
- 470nm - 0.091 -- some blue LEDs emit at this wavelength
- 480nm - 0.139
- 490nm - 0.208
- 500nm - 0.323
- 510nm - 0.503
- 520nm - 0.710
- 530nm - 0.862
- 540nm - 0.954
- 550nm - 0.995
- 555nm - 1.000
- 560nm - 0.995 -- 565 nm is the wavelength of peak emission for common green LEDs
- 570nm - 0.952
- 580nm - 0.870
- 590nm - 0.757 -- 595nm is a clear yellow with some green. Sodium streetlights emit at 589nm - you know, those god-awful intensely yellow lights they use to light up roads (and my bedroom) at night
- 600nm - 0.631
- 610nm - 0.503
- 620nm - 0.381
- 630nm - 0.265 -- 635nm is emitted by common orange LEDs and 'ultra bright' laser pointers
- 640nm - 0.175
- 650nm - 0.107
- 660nm - 0.061
- 670nm - 0.032 -- most laser pointers emit at this wavelength
- 680nm - 0.017
- 690nm - 0.0082
- 700nm - 0.0041 -- common deep red LEDs emit at 697nm
- 710nm - 0.0021
- 720nm - 0.00105
- 730nm - 0.00052
- 740nm - 0.00025
- 750nm - 0.00012
- 760nm - 0.00006
Infrared remote control LEDs often emit at 940nm.
Luminous intensity of a light source is measured in
candela - a measurement that takes into account how bright the light source
looks instead of just how many
photons it is emitting. This is probably why
super-bright green
LEDs have the current highest m
cd rating of any
LED - they emit at close to the human eye's maximum sensitivity, thus appearing really, really bright.
Table of spectral sensitivities taken from Documenta Geigy Scientific Tables 6th edition, published 1962. See page 239