A few ways to affect color through lighting:
•To warm up a room's color: Look for a bulb with a temperature close to 2,700 Kelvin. Halogens are a good choice, but all types of bulbs are available in warmer ratings.
•To cool down a room's color: Look for a bulb with a temperature close to 4,000 Kelvin. Standard fluorescents will generally cool down a room, but check the numbers.
•To most accurately replicate natural daylight: Midday sunlight is around 5,000 to 6,000 Kelvin, but keep in mind that this is very cool light — contrary to what you might expect.