lighting by neon lamps

A neon lamp. / The light from such a lamp.

a magnesium lamp / the intense light from such a lamp

A warning light, especially as a traffic signal indicating stop. / A sign of a brothel. / (idiomatic) Denial to proceed; a ruling out of any possibility.

Any industry that does not require high capitalization or heavy machinery.

Alternative spelling of lighthearted

(physics): In special relativity, the pattern describing the temporal evolution of a flash of light in Minkowski spacetime. This is modeled in 3-space using the two horizontal axes as spatial dimensions, while the vertical axis is time.

(photography) An exposure meter / Any of various devices that measure some property of light

The aurora of the southern hemisphere.

(dated) A display of coloured lights that move in shifting patterns.