Color temperature a description of the color of the loss in values of Kelvin, a symbol is K. A warm light is 2500 to 3000 K. Although you can get higher than this with artificial lighting, neutral watch light 3000 to 4000 Kelvin and cool white light is 4000 to 5000 Kelvin. natural daylight is above 5000 Kelvin. application of different color temperature lamps use warm watch or extenuating warm colors of red, brown and cream. Use cool white with cool colors like gray and blue is daylight colors in hot climates, as a warm lamp will make people feel hot off. Incandescent tungsten halogen, sodium vapor are all below 3300 degrees Kelvin. Intermediate such as fluorescent metal halide is intermediate between 3300 to 5300 degrees Kelvin, and cool fluorescent mercury vapor lights are above 5300 degrees Kelvin.

Above 90 should be color matching, such as pitcher galleries or display pieces. 80 to 90 should be in homes, restaurants, and even textile industry factories and 60 to 80 in offices, schools and the light industry display 40 to 60 is heavy industry factories and outdoor lighting such as car parking as referenced earlier should be 20 to 40