Correlated Color Temperature (CCT)
Definition of Correlated Color Temperature
Correlated Color Temperature, or CCT, describes the color appearance of a light source and how “warm” or “cool” the light looks to the human eye. It’s measured in degrees Kelvin (K) and provides a standardized way to compare light color across different fixtures and technologies.
CCT represents the color of light emitted by a source in relation to an ideal black-body radiator. For example, a lower CCT value (around 2700K) produces a soft, yellowish glow similar to traditional incandescent bulbs. A higher value (like 6500K) gives off crisp, bluish light that mimics daylight.
Why CCT Matters in Marine Lighting
Understanding CCT helps boat owners and marine electricians choose lighting that enhances both visibility and ambiance onboard. The right color temperature affects how colors appear, how comfortable the light feels, and how well it supports various tasks.
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Warm white (2700K–3200K): Ideal for cabins, salons, and courtesy lighting where comfort and relaxation are the goal.
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Neutral white (3500K–4500K): Balanced tone for general illumination.
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Cool white (5000K–6500K): Crisp, bright light suited for work areas, engine rooms, or deck lighting.
CCT and Color Accuracy
While CCT defines the shade of white light, it doesn’t indicate how accurately that light reveals colors. That’s where the Color Rendering Index (CRI) comes in. Pairing the right CCT with a high CRI ensures objects, surfaces, and finishes appear true to life, especially important on yachts where aesthetics and safety both matter.
Example in a Sentence
“The CCT of a marine LED light, measured in degrees Kelvin, determines whether the light gives off a warm or cool appearance and helps set the mood onboard.”
Related Terms
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Color Temperature – Basic measure of light’s warmth or coolness
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Lumens – Brightness or total light output
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Courtesy Lights – Low-intensity lights used for ambiance or pathway illumination