CRI (Color Rendering Index) is the ability of a light source to render an object in true colors when compared to Incandescent

What is CRI and why is it important?

 Have you ever put on a blue suit and black socks only to walk outside into sunlight and you discover that your beautiful blue suit is black and your socks are brown? If you have ever gotten dressed under the dingy light of a poor quality CFL light the story may sound just like that.  

What is good CRI for Light Bulb?

 A good CRI in a light bulb should be considered to be 85 plus.
The colour-rendering index was introduced at the time when the second-generation
fluorescent lamps (deLuxe type) have been brought onto the market.  
At the time of developing the compact fluorescent lamp phosphors, they have been optimised to achieve good efficacy and high colour rendering index, and not good visual colour rendering. 
 
Today, a major technological
breakthrough has led to a new generation of light sources based on LED technology. 
The emission spectra of these is different from that of fluorescent lamps, thus optimising these to 
achieve a high colour rendering index could again lead to differences between calculated  and observed colour rendering. 
Before one can recommend a new mathematical model for calculating a colour-rendering - Read More

Why LED's?

LEDs are emerging as a superior lighting alternative to incandescent and fluorescent light. Free of filaments, gas or mercury, these high-brightness, solid-state devices eliminate a full range of lighting problems including costly energy consumption, toxic materials, troublesome periodic maintenance, and limited color control. In fact, LEDs consume about 1/10th the energy of incandescent light and typically exceed 50,000-hour lifetimes. Read More

Subpages (2): CRI - Abstract Why LEDs