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Understanding how to use light to set a mood and accent a room is an important skill for an interior designer to have. One of the key elements that interior designers adjust when designing a room are the types of light fixtures and light bulbs used to light a room and the relative color temperature of the light emitted. There is a range of color that lights give off from warm to cool, and understanding how the color temperature scale works comes in handy if you’re considering a career as an interior designer.