Light sources adapted to spectral sensitivity of diurnal avians and humans
Various apparatus and associated methods involve a light source that provides light at wavelengths that substantially correlate to local maxima in the spectral sensitivity of a diurnal avian. In an illustrative example, the light source may output light primarily in wavelength bands that are not substantially absorbed by colored oil droplets and/or visual pigment in at least one type of cone in the eye of a diurnal avian. In some embodiments, the light source may include a light-emitting diode (LED) light source. Exemplary light sources may output spectral components to illuminate diurnal avians with local maxima of intensity at wavelengths that substantially correspond to local maxima in a spectral sensitivity visual response characteristic of the diurnal avians.
1. A method of illuminating diurnal avians in a substantially enclosed habitat with artificial light sources, the method comprising:
supplying a first light having a first spectral content between 380 nm (nanometers) and 780 nm, the first light having a first local maximum in relative intensity at a first wavelength between 450 nm and 520 nm corresponding to a first local maximum of visual spectral sensitivity of the diurnal avian;
supplying a second light having a second spectral content between 380 nm and 780 nm, the second light and having at least one local maximum in relative intensity at a second wavelength between 530 nm and 590 nm corresponding to a second local maximum of visual spectral sensitivity of the diurnal avian; and
supplying a third light having a third spectral content below 400 nm corresponding to a third local maximum of spectral sensitivity of the diurnal avian.
2. The method of claim 1 , further comprising:
converting the first light to the second light.
3. The method of claim 1 , further comprising:
supplying a fourth light having a fourth spectral content between 380 nm and 780 nm, the fourth light having a fourth local maximum in relative intensity at a fourth wavelength within 30 nm of a fourth local maximum of visual spectral sensitivity of the diurnal avian.
4. The method of claim 3 , wherein the at least one local maximum in relative intensity of the fourth spectral content is between 590 nm and 620 nm.
5. The method of claim 3 , wherein the at least one local maximum in relative intensity of the fourth spectral content is between 630 nm and 680 nm.
6. The method of claim 1 , wherein the first light is gradually dimmed leaving only the second light and the third light.
7. The method of claim 1 , wherein the first light and the second light are gradually dimmed leaving only the third light.
8. The method of claim 1 , wherein the first light, the second light, and the third light are sequentially provided to the diurnal avians.
9. The method of claim 1 , wherein the first light and the second light are supplied by a composite source.
10. The method of claim 1 , wherein the first light and the second light are supplied by a single LED.
11. The method of claim 10 , wherein the third light is supplied by the single LED.
12. The method of claim 1 , wherein the first light, the second light, and the third light are supplied by a composite source.
13. The method of claim 12 , wherein the composite source includes a network of white LEDs, ultraviolet LEDs, and green LEDs.
14. The method of claim 12 , wherein the composite source includes a network of green LEDs, ultraviolet LEDs, and blue LEDs.