Color Rendering Index (CRI)
White light that we see is made up of all the various wavelengths/colors of light that we can see. Not all light sources can fully reproduce that entire spectrum, so we rate how much of it they can produce based on a 100 point scale called the Color Rendering Index. 100 is a perfect score, and that’s produced by the sun and incandescent bulbs. A score of 90 or higher is considered “High CRI” and that means the source reproduces 90% of the visible color spectrum. Most LED’s are rated at 70CRI, which is 70% of the visible color spectrum.
Color Temperature (CCT)
Color temperature is a measure of the blue/amber shift in a light source. It’s based on the light color that an element like tungsten will emit when heated to the specified temperature in Kelvin. It’s a spectrum but it can be divided roughly into three sections.
- “Warm white” appears amber and is generally considered to span roughly 4000K or lower. Most incandescent bulbs fall into this range.
- “Neutral white” appears pure white and is generally considered to spam from roughly 4000K to roughly 5700K. This range looks best to most people.
- “Cool white” appears blue and is generally considered to span roughly 5700K and up. Most LED’s fall into this range.
DUV is a measurement of the green or magenta tint in a light source. A positive value looks green and a negative value looks magenta. +/-0.0010 is not very noticeable. +/- 0.0100 is very noticeable.