plural of Christmas light

An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.

(Australia) A light bulb. / A nearly evacuated glass globe containing ionized gas (plasma), which produces lightning-like patterns when touched.

(chemistry) Water in its standard form of H₂O, containing two protium hydrogen atoms, as opposed to heavy water.

The amount of light falling on a given area, as measured by units such as the lumen.

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

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

One of a race of elves who live above ground and are radiant. / (Norse mythology) A daylight dwelling elf or nature spirit (as opposed to the underground dwelling dark elves or dwarves).

(cricket) The lighter of the rollers used for flattening the pitch between innings.

(astronomy, idiomatic, informal) A reflecting telescope, especially one with a relatively large aperture and suitable for observing deep sky objects such as nebulae and galaxies.