Coordinated adjustment of display brightness

One or more tangible, non-transitory machine-readable media having recorded thereon instructions, that when executed by one or more processors, perform operations that comprise:

• identifying a change in a first parameter for light delivered by a light-generating appliance, the identifying of the change being caused by an input external to the light-generating appliance;
• determining, automatically with a component of the light-generating appliance and in response to identifying the change in the first parameter, a level of change to be made in a second parameter for light delivered by the light-generating appliance, wherein a direction of the change and amount of the change in the second parameter are selected so as to offset a change in circadian stimulation to a user of the device that results from the change in the first parameter, and wherein one of the first and second parameters is brightness and an other of the first and second parameters comprises a non-brightness parameter;
• and
• changing the second parameter based on the determined level of change to be made in the second parameter, in association with the change to the first parameter,
• wherein the offset comprises (a) decreasing color temperature value in response to an increase in brightness, (b) decreasing brightness in response to an increase in color temperature value, (c) increasing color temperature value in response to a decrease in brightness, or (d) increasing brightness in response to a decrease in color temperature value.