I am designing a LED system that will simulate the sunrise/sunset by changing the proportions/intensities of different light wavelength over time - IR, Far Red, Red, Green, Blue, Deep Blue, UV
Could you share any relevant research on that?
Please have a look at the diagram in:
https://www.handprint.com/HP/WCL/color1.html
and the reference of that diagram.
The following may also help you:
Article Using Natural and Artificial Light Sources to Illustrate Qua...
Sun radiance spectral distribution referred in the two previous answers stay constant all the time. During sun set and sunrise sun spectral illumination at the earth surface is changing due refraction through atmosphere actin as prism when sun pass horizon during sun rise and sun set. The apparent color depends on geographical position and atmospheric conditions.
For example see Herna´ndez-Andre´s et al. "Color and spectral analysis of daylight in southern Europe", J. Opt. Soc. Am. A/ Vol. 18, No. 6/June 2001.
Search web using querry: "Sun illumination change during sunset and sunrise, spectral data, pdf" and review first few pages. You will find several very nice references.
Great! Thank you all for the answer
Because I am trying to get as close as possible to the real sunrise/sunset - lets say in Spain (or any long day country in summer) to see its effect on plants' growth and biomass.
What are the critical parameters I need to take into account when simulating sunset/sunrise (a.k.a. LED fading) other than duration???
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