We only selected stations with an associated population greater than 2 million, and had a very high night - light brightness according to two different satellite estimates. (globalwarmingsolved.com)
Both e-readers let you adjust light brightness via touchscreen, but only Amazon's interface tries to explain which light settings are right for you. (mashable.com)
The distances to very luminous objects can be derived using the inverse square law of light brightness if their luminosity is known. (astronomynotes.com)