Impact of media on CRI

[oharag]

Hello - my first post here - lots of cool stuff on this forum.

I have a question concerning CRI. I posted on the LED forum since that is what I'm working with - but this could be applied to any light source.

Okay - I know for a fact that different media (i.e. glass, acrylic (plastics in general), polyesters (films - diffusers et, al)) can change the color temperature of a light source on the output side (through absorption of different wave lengths - or shifting). What about CRI?

Some asked me how CRI is impacted through different media. This perplexed me. I know a source has a specific color temp and it determines how the source appears upon a surface or when looking at it (warm - yellowish - neutral - somewhat yellow and cool - blueish). CRI determines how objects appear under that source.

Is color temp and CRI related? Are they impacted the same way (ie absorbed through media)?

Does anyone have literature/websites/studies or general knowledge of how CRI is impacted by different media?????

Thanks for reading my rambling post.

 

[McGizmo]

I am no expert by any stretch but to my knowledge, CRI by definition is based and dependent on a specific color temp of a black body radiator. It tells you how your source will compare to a black body source of the same color temp in regards to the rendering of colors. There are actually a group of CRI's measured with an average, CRIa that is the typical number we see mentioned or cited.

Any media that filters and removes any light unless completely uniform across the visual spectrum, will no doubt change the CRI. It may well change the measured color temp as well, which I think you have said is the case.

 

[Tekno_Cowboy]

There is some good links to info on the subject in the modding thread in my sigline.