12/15/2023 0 Comments Solid black light colorMost R9 in general LED is closer to 40-50. Grow lights require a full spectrum, known as PAR for best results. In this chart we see the light is about 4100 kelvin and 93 CRI, The R9 drops to 75, which is actually excellent because this is a grow light. Now most lighting spectrum charts will generate all the data. Here is an example where the CRI would be high, but the low R9 does not tell the whole story. The perfection is also known as sunlight. Generally incandescent is the benchmark or reference light (black body radiator in the lab, but that's a much longer article) but really the 100 score on an R15 measurement would be perfect. So you have to do all well to score very high. Whether its CRI., R9 or R15 the numbers are an average. For designers and users anyway, less so for manufacturers as we'll get to below.Ī: R9 is calculated as a average of R1-R9, which is the pastel color group up to red. R9, however adds that important Red color which is why its becoming a more preferred metric in lighting. You can see that CRI uses a limited, albeit critical part of the scale. Here is how CRI, R9 and R15 are calculated. Thus colors with red in them will show much better in a high R9 score. ( For reference solid saturated colors are R9-R12 and earth solids are R13 to R14) The big one, however, is R9 because that is red! R9 is one better than CRI because it adds the all important Red spectrum. Since R10-R15 are generally not an improvement in color reproduction, those are skipped. CRI is a 1960 standard, but in reality there are 15 color bands, these are referred to as R15. The higher the CRI the better those colors show. Incandescent and halogen do a good job of color rendering (CRI 95+), where HID sources typically are low color rendering (sub 50 CRI)ĬRI is based on the R1 to R8 colors only, also known as the pastel colors. Just because a light is white does not mean that colors will show true underneath it. A: CRI (color Rendering index) and R9 (average of R1-R9) reflect how well a light will reproduce colors.
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