Thanks for your question! CRI stands for the color rendering index, and in short, is the measurement of how light affects the colors you see. A CRI score tells us how well a light source reflects the true colors of an object that it shines upon. A higher score on the index (1-100) means that the light will not distort how colors look or throw a weird color cast. A high CRI is great for bathroom vanity lights, for example, where you might be applying makeup. This Ronan fixture scores 90+ on the CRI scale, making it ideal for a vanity. You can learn even more about CRI here. Hope that helps!