invisible light

in·vis·i·ble light

historic term for x-rays.
References in classic literature ?
It was a magnificent cave, illumined by the soft, invisible light, so that everything in it could be plainly seen.
There are some bad nights in the kingdom of the West Wind for homeward-bound ships making for the Channel; and the days of wrath dawn upon them colourless and vague like the timid turning up of invisible lights upon the scene of a tyrannical and passionate outbreak, awful in the monotony of its method and the increasing strength of its violence.
There is invisible light called Ultraviolet [UV] rays which have high energy.
Throwing out beams of invisible light, it plots obstacles and walls, the narrowness of corridors and the expanses of open areas that it can then - gratefully - accelerate into.
Osram is increasingly focusing on intelligent technologies in the field of visible and invisible light for the market fields of visualisation, sensor technology and treatment.
With LiFi receivers one Infinity LiFi X bulb can transmit data via invisible light over a 50 square meter space, ideal for small conference rooms or offices.
After a decade of work, a team of researchers has achieved a "breakthrough" that could make use of invisible light to make solar panels more efficient.
It is developing sensor technologies that can quickly measure distances or detect invisible light that are expected to be used in autonomous driving, factory automation and robotics, they said.
"We analyzed their potential and show that by harvesting only invisible light, these devices can provide a similar electricity-generation potential as rooftop solar while providing additional functionality to enhance the efficiency of buildings, automobiles and mobile electronics."
Astronomers around the world quickly turned their telescopes and dishes towards a small patch in the southern sky and also saw the flash across the visible and invisible light spectrum.