/ˈvɛs.pɪ.lʌks/
noun · etym: noemic latinate · vesper- (evening) + -lux (light) · attested in the lexicon of the library from the period of unlit halls
the small light that rooms develop in the hour before lamps are lit.
vespilux is not the light from outside, nor is it the absence of light. it is what a familiar room produces between those two, drawing on memory, on the pale ghost of the afternoon, on the bone of the wall.
the inside of a kitchen at five o'clock in november: that is vespilux. one can read by it for perhaps three more minutes. the candle is found and lit at a certain threshold not because the room has gone dark but because vespilux has begun to turn inward.
in a sentence: "i did not put the lamp on. the vespilux was sufficient for what i was trying to remember."