Something about Color Rendering:
Something about Color Rendering:
Ra=(R1+R2+R3+R4+R5+R6+R7+R8)/8, while:
R1 Light greyish red
R2 Dark greyish yellow
R3 Strong yellowish green
R4 Moderate yellowish green
R5 Light bluish green
R6 Light blue
R7 Light violet
R8 Light reddish purple
R9 ??
R10 ??
R11 ??
R12 ??
R13 Light yellowish pink (skin)
R14 Moderate olive green (leaf)
Do you know R9-R12 stand for what?
A. Strong green B. Strong red C. Strong blue D. Strong yellow
Check and see if your answers is correct or not.
PS: R9-R12 are very important for high quality lighting, for example, R9 is a key evaluation for meat or any other red commodities; R10 is important for bread shop. ....
What's more, R9-R14 is not in included in the Ra, so, you need to pay more attention on the R9-R14 value.
The current standard(CIE1931) is too old and out of day now. Thus, more any more new regulations are going to replace on Color Rendering Index, as R1-R8 is not good enough to evaluate the light quality. There are CQS(color quality scale) , GAI(gamut area index ), Ra +Rf..., but these new regulations still a draft, not finalized.
Email me if you have any questions on the Color Rendering, Below Black Body Line Curve.... issues.
Hendy Zhang ([email protected])
+86 158 1742 5258
Lighting Designer - MIES
8 年Very good simple explanation, even I understand it now.