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>CRI compares a light source to an ideal black body, not necessarily daylight. Isn't the sun a pretty-close-to-ideal black body emitter? Is there something sp
by flubert 10y ago
>CRI compares a light source to an ideal black body, not necessarily daylight.
Isn't the sun a pretty-close-to-ideal black body emitter? Is there something specific you are thinking of that makes daylight deviate significantly from black-body radiation? (Rayleigh scattering in the upper atmosphere?)
- aardvark179 10y agoThe sun provides a spectrum with a temperature of roughly 6500K, domestic lightbulbs produce something more like 2700K up to 3000K. The biggest difference between incandescent and CF/LED lights is that the spectrum from an incandescent bulb is quite smooth, whereas other lights tend to have a much spikier spectrum meaning you may see some odd colour effects from them and certain materials.
- lutorm 10y agoIndeed it is, but that doesn't mean anything illuminated by a blackbody "match the hue of objects seen in natural daylight." CRI has much more to do with the ability to discriminate colors. The absolute hue is a strong function of the color temperature of the illumination, but the eye/brain is also very good at normalizing that away. This is precisely why I don't think people complaining about "nasty cool light" are based in fact. The color of the environment around you will quickly be normalized to be neutral by your brain, and it will be impossible for you to tell whether you are illuminated by a 3000K or 5500K light. You can really only tell color differences accurately.