Warm White Screen

What "3000K warm white" means here

A color temperature such as 3000K describes the color of a light: 3000K is the warm, slightly orange white of many household bulbs. A web page cannot produce a light source, but it can ask the display to show the color that has the same tint as that light. On a display that follows the sRGB standard, the color of 3000K light is #FFB86D: red fully on, green at level 184 and blue at level 109 out of 255.

The value was calculated, not picked by eye. The standard formula for the color of 3000K light was converted to sRGB and rounded to whole levels, which moves it by about 12K. Nearby temperatures within about 15K round to the same color.

Using it as a warm light

1. 1

   Open it full screen. The browser toolbars add cooler white light around the color.

2. 2

   Place the display in front of you. For a video call, set it slightly above eye level. A screen is a small light source, so keep it close.

3. 3

   Set the brightness. Warm white is dimmer than pure white, about 57% of the brightness of the White Screen at the same settings, because green and blue are reduced.

Limits of a warm white screen

The match holds only on a display set to the sRGB standard with its usual white point. Many displays use other settings, and night mode, True Tone, and blue-light filters shift every color, including this one. The color matches 3000K light, but the light still comes from the display's red, green, and blue subpixels, so objects lit by it can look different than under a 3000K bulb. For the neutral daylight white of a standard display, use the Cool White Screen.

This screen's exact value has its own #FFB86D color page, with its RGB and HSL values and its contrast against black and white.

This screen is a light, not a remedy for eye strain; Eye Strain: Settings That Help covers the screen settings eye-care bodies recommend.