blue light

[bloo lahyt]

noun

1. a band of the visible light spectrum that has a shorter wavelength and produces higher energy than other colors of light: occurring in sunlight and emitted by electronic devices that use LED technology.

2. American History, Usually Disparaging.,  Also Blue Light a member of a faction of the American Federalist party considered disloyal for opposing the War of 1812: so called from the claim that they flashed blue light signals to alert the British to the presence of blockade runners.

Word History and Origins

Origin of blue light¹

First recorded in 1810–15

Example Sentences

The atmosphere scatters away more short-wave blue light, leaving the longer-wave reddish hues to project upon the Moon.

Read more on BBC

She adds that teens "still need lots of sleep", which can be disrupted by overnight notifications or late-night exposure to blue light through smartphone screens.

Read more on BBC

Humor is derived from individual perception, and it’s hard to see much of the world stuck in the blinding blue light of a digital silo.

Read more on Salon

Too many of us wake up and consume blue light before sunlight, fumbling in the dark for a smartphone or a tablet to see what fresh Hell the push notifications have in store for us today.

Read more on Salon

They gaze in wonder as the bottom of the ship opens up, revealing a warm blue light.

Read more on Los Angeles Times