No threshold to prevent light flicker in very low light scenes

[nfsmaster208]

If a scene that is very dimly lit occurs, a lamp may flash very rapidly as it tries to reproduce the scene on the display. It seems plausible that the lamp may be attempting to produce light below its minimum threshold. This may result in observed rapid switching between off and on in a dark scene. An option to reduce flicker and strobing, particularly when the fade and delay variables have been lowered considerably, would likely alleviate this issue.

[stringandstickytape]

Essentially this is because you can specify a maximum brightness in the Screen Response UI, but you can't specify a minimum brightness. Being able to specify a minimum brightness (of 1 or higher) would probably do the job...

[stringandstickytape]

Will be fixed in next version.