Brownout

Noun

 * 1) Temporary dimming of vision, usually with a brown hue and accompanied by loss of peripheral vision or tunnel vision.
 * On rising suddenly from her chair she experienced a brownout and had to sit down again quickly.
 * 1) A sustained period of low alternating current line voltage
 * When demand for electricty exceeds the available supply, a brownout occurs.

Alternative forms

 * brown-out

Synonyms

 * grayout, greyout