A lower kelvin number mean the light appears more yellow; higher kelvin numbers mean the light is whiter or bluer.
CFLs and LEDs are made to match the color of incandescent bulbs at 2700-3000K.
If you prefer a whiter light, look for bulbs marked 3500-4100K.
For bluer white light, look for bulbs marked 5000-6500K.
Is white or yellow light better for studying?
So white light is more preferable than yellow light for studying purpose. White bulbs (6000k or higher ) are better for study because White light releases certain chemicals in our body to make us attentive compared to yellow light. You may think of a bulb that is similar to natural sunlight.
Why do some light bulbs look yellow?
The lower the Kelvin number (between 2700K to 3000K), the more yellow the light. Higher Kelvin numbers, say 5500K to 6500K, emit a bluer light. For a white light, look for bulbs marked 3500K to 4100K. In January 2012, all lightbulb boxes will be required to tell consumers where the bulb falls on the color spectrum.
What light bulbs are white?
The three primary types of color temperature for light bulbs are: Soft White (2700K – 3000K), Bright White/Cool White (3500K – 4100K), and Daylight (5000K – 6500K). The higher the Degrees Kelvin, the whiter the color temperature.
Which light is best for reading?
No matter what your personal lamp style, experts say that halogen and fluorescent bulbs generally do a better job of illuminating reading material than normal incandescent bulbs. Halogen bulbs produce a whiter light that is perfect for reading and the sharp white light ensures good page illumination.
Photo in the article by “President of Russia”