What is Kelvin (color temperature)?

What is color temperature & Kelvin, really?

First things first: color temperature has nothing to do with how hot the bulb gets! Instead, it describes how visually "warm" or "cool" the white light appears.

The Kelvin scale is a bit counter-intuitive, but here's a simple way to think about it. Imagine heating a piece of metal. As it gets hotter, it first glows a deep red, then orange, then yellow, then a brilliant white, and finally a bluish-white. The Kelvin scale is based on that color progression.

Here’s the tricky part you need to remember:

• A lower Kelvin number means a warmer, more yellow/orange, cozier light.
• A higher Kelvin number means a cooler, more blueish, crisper light.

So, a 2700K bulb is warm and cozy, while a 5000K bulb is cool and energizing. Easy, right?

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Which light temperature for which space?

Different moods and tasks call for different types of light. Here’s a simple guide to choosing the right Kelvin value for every space.

Extra Warm White (Under 2700K)

The Vibe: Super cozy, intimate, and relaxing. Think of the glow from a candle or a fireplace.

Perfect For: Creating a really comfortable atmosphere. Use it for accent lighting, bedside lamps, or in a cozy reading nook to help you wind down.

Warm White (2700K - 3000K)

The Vibe: This is the classic, inviting, and welcoming light that most of us are used to in homes. It’s relaxing but still clear enough for everyday activities.

Perfect For: The go-to choice for living rooms, bedrooms, dining rooms, and hallways. It makes everyone feel comfortable and at home.

Neutral White / Cool White (3500K - 4500K)

The Vibe: Bright, clean, and vibrant. This light feels more like clear, natural daylight and can make you feel more alert and focused.

Perfect For: Task-oriented spaces where you need to see clearly. Think kitchens (for chopping veggies!), bathrooms (for applying makeup!), home offices, and garages.

Daylight (5000K and above)

The Vibe: Very crisp, intense, and blue-tinged. It can feel a bit clinical or industrial in a home setting.

Perfect For: Specific task lighting where maximum clarity is needed (like a workbench for detailed hobbies), commercial spaces, or security lighting. It's less common for general home ambiance.

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Don't confuse Kelvin with Lumens or CRI

This is a common mix-up, so let's clear it up. These three things describe different qualities of a light bulb:

• Kelvin (K): The COLOR of the light (warm vs. cool).
• Lumen (lm): The BRIGHTNESS of the light (how much light it produces).
• CRI: The QUALITY of the light (how accurately it shows colors).

You can have a very bright (high Lumen) bulb that is also very warm (low Kelvin). They are independent of each other!

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You're in control of the mood

And there you have it! Kelvin isn't some scary scientific term; it's your personal control dial for the mood and functionality of every room. By choosing the right color temperature, you can make your living room cozier, your kitchen more functional, and your office more productive.

Next time you shop for lights, you can confidently pick the Kelvin value that's perfect for your needs. Still have questions? Our lighting experts at Fixerio are ready to help!