Matias RGB Backlit Wired Aluminum Keyboard for Mac

The backlight on this keyboard was SPECIFICALLY designed to address that problem…

Turning the Color Dial all the way to the left or right gets you White (which is 100% Red, Green, and Blue). You can adjust the brightness of the backlight (in 10% increments) anywhere from 0 to 100% …

Hold down the –/+ backlight key, then press + or – to increase/decrease the brightness. You can also select a brightness level directly, by holding down the –/+ backlight key, then pressing a number (1 = 10%, 2 = 20%, etc.).

Source: matias.ca