Technical Explanation: The CRI is a unit that measures the ability of a light source to reproduce the colors of objects faithfully in comparison with an ideal source of light, or natural sources such as sunlight. The CRI is a determined value from 0 to 100, with 100 being the value “perfect” or daylight.
Real World Explanation: The CRI determines how you and your surroundings appear to you and the other people in your environment.
I think the following article that appeared yesterday in The New York Times is great reading for everybody, not just lighting professionals.
I do not sell any of the LED mentioned here, but you can see that there is trend starting. Be picky. Get the color temperature you want. Be sure to visit FoggLighting.com for some great lighting.