brownout

Short definition from Wiktionary

Noun

1. 1
   A period of low alternating current line voltage, causing a reduction in illumination.
2. 2
   A temporary dimming of vision, usually with a brown hue and accompanied by loss of peripheral vision or tunnel vision.
3. 3
   A temporary closing of a fire station, usually due to budget restrictions.
4. 4
   A power outage during the day; distinguished from a blackout, which occurs at night.
5. 5
   A moment or period where something is weakened, diminished or less effective.
6. 6
   A blackout, regardless of time of day.