What is another word for light-out signal?
Pronunciation: [lˈa͡ɪtˈa͡ʊt sˈɪɡnə͡l] (IPA) 
A light-out signal is an indication that it is time to turn off lights. However, there are several other synonyms for the same concept. For instance, a blackout warning means that all lights must be turned off immediately. Likewise, a lights-off signal or a light curfew indicates that it is time to switch off all sources of light. In some contexts, a dim-out may be employed to reduce the amount of light used in a given space. Ultimately, the many synonyms for the light-out signal all prompt people to be responsible about their use of electricity and encourage them to take steps to conserve energy.
