When you see the color temperature rating of a light bulb, it's always designated with a “K." That indicates that you're seeing Kelvin units. Correlated Color Temperature (CCT) in lighting describes the color that light appears from a lamp, measured in Kelvin (K).
CCT is usually measured in the range of 1000K to 10,000K (the actual range is much wider). The higher the Kelvin number, the closer the light is to blue sunlight. For example, if 10,000K is the temperature you see on a sunny day with no clouds or fog, then 6,000K would provide a cool white temperature on cloudy daylight.
Most homeowners choose light options that are 2,700K or 3,000K, which is a bit yellower than the evening sun while being less orange than the sunrise.
The traditional incandescent light bulb with a filament typically emits light at 2,700K.
When you use an LED bulb with a 2,700K temperature rating, the color and tone you receive are similar to what an incandescent bulb delivers. Anyone who loves the yellowish-orange shading from traditional bulb types will appreciate this choice，which creates a homey atmosphere that will make you feel warm and relaxed at home.
The issue involves the color and tone you'll see in a room with a 2,700K bulb. If you have broad spaces or a lighter interior, the results will create something that feels close to a hug.
When your room has wood panels, dark furniture, or small spaces to use, the soft light in those circumstances can almost feel like it smothers you. In that situation, it might be better to look for a 3,000K bulb that works for your needs.
Although the differences between a 2,700K and a 3,000K bulb are minor, you'll find that it is slightly more neutral. There's less orange and yellow tone to it, which means you'll see a bit more contrast with the shadows instead of diffusion.
Furthermore, it offers a touch of extra color acuity while delivering task-based light solutions for specific situations.
If you're sensitive to different colors, a 3,000K LED light is an excellent choice for those who want less orange. When color tone and temperature are secondary considerations, the differences between these two choices are minimal or hardly perceivable in some situations.
With only 300K degrees difference between 2,700K and 3,000K, the color difference isn't noticeable. After all, even different manufacturers produce slightly different tones within the same rating.
You can see similar changes when looking at two 2,700K or 3,000K bulbs at the same time.Unless you have them next to each other with multiples, the two color temperatures work relatively well together. They create a slight diffusion that lightens the traditional soft white tones without being overwhelming.
The Kelvin measurements for light bulbs shouldn't be confused with the absolute temperature scale named after Lord Kelvin. Those ratings are based on actual temperature, comparable to the Fahrenheit and Celsius options.
When you see a color temperature rating of 1,000K, you have the equivalent of a candle's flame. At 2,000K, you have the color of an early sunrise or a late sunset.
At 3,000K, you find a color tone similar to halogen bulb types when using LEDs. Incandescent bulbs typically fall between 2,000K and 3,000K, so the outcome is similar once installed in a home.
A warm, white LED is closer to 4,000K, putting it outside the window of the 2,700K or 3,000K choice for residential lighting.
Soft light has similar brightness, but it delivers more visual balance to the environment. The transitions between light and shadow occur in gradients instead of defined lines, creating more of a bathing effect within an interior setting.
If you think about how the world looks on a cloudy day, add a bit of extra diffusion and orange tones to replicate what a 2,700K or 3,000K LED bulb provides. That type of lighting is called “soft white," and both ratings offer it.
That's in contrast to the three other common LED bulb color temperatures that you can find available today.
Installing a 6,500K LED bulb for office work can make it easier to focus on a specific task, as softer yellow tones in the 3,000K or lower range will make it easier to relax.
For residential, 2,700K or 3,000K LED lights are usually installed. It's not quite as orange as the standard incandescent bulbs of the past, nor does it contain too much blue light spectrum to feel overly stimulating.
For anyone concerned about health effects from exposure to the blue light spectrum, the lower 2,700K temperature is a better option. 3,000K LED bulbs will give you a cleaner look without being overly noticeable.