It means that a low CRI light bulb makes funky light that will distort colors! A perfect 100, for example, is an incandescent bulb with a color temperature of 2700K. https://www.cnet.com/news/shining-a-light-on-high-cri-led-bulbs The higher the CRI, the better the color will be represented. A CRI of 100 represents the maximum value. OK, but what does that mean? https://www.lumens.com/light-bulb-facts/color-rendering-index.html The color rendering index has a value between 1 and 100 and has no unit. For display or accent lighting where color is important, choose these LED PAR38 flood light bulbs with a high color rendering index … LED A21 - 17 Watt - 100 Watt Equal - Halogen Match - 2 Pack Color Corrected - CRI 90 - 1600 Lumens - 3000 Kelvin - Medium Base - 120 Volt - Euri Lighting EA21-4000cec-2 Life Hours: 25,000 The CRI value, on a scale of 0 to 100, is used to compare one LED light to another. Incandescent lamps have a CRI above 95. CRI or Color Rendering Index is a scale from 0 – 100 that measures a lights ability to render colors accurately compared to a natural light source. High-CRI LED lighting is a light-emitting diode (LED) lighting source that offers a high color rendering index (CRI). An incandescent bulb has a CRI of 100. High CRI and R9 values: CRI (Color Rendering Index) measures color accuracy relative to incandescent bulbs, or natural daylight. Natural light (sunlight) has a CRI of 100. Lower CRI values indicate that some colors may appear unnatural when illuminated by the lamp. If one has a CRI of 80, which most LED bulbs currently do, and you see another one has a CRI of 89, then you know that using the latter will show more saturated colors than the former. CRI is a quantitative measure of a light's ability to reproduce the colors of objects faithfully in comparison with an ideal or natural light source. Cool white fluorescent lamps have a CRI of 62, however fluorescent lamps containing rare-earth phosphors are available with CRI values of 80 and above. LED PAR38 - 100W Equal - High CRI. Fluorescent lamps, on the other hand, only have a CRI of 60 to 90. The effect of a light source on colour appearance is measured in the colour rendering index (CRI), on a scale of 0-100. Incandescent and halogen lamps also have the maximum color rendering index of 100. Many of the incandescent and halogen "replacement" LED lights currently on the market use less energy but are not true replacements as the white light they emit is of relatively poor quality. Natural outdoor light has a CRI of 100 and is used as the standard of comparison for any other light source. High CRI LED Lighting High quality, energy efficient, high CRI Not all white light is the same. The CRI of Philips LED lighting products is always higher than 80, close to natural light. 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