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A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.

Hiker with head torch admiring stars on Monte Paterno and Tre Cime di Lavaredo, Sesto Dolomites, South Tyrol, Italy, Europe

Hiker man cooking outside camping tent at Obere Schwarziseeli lake at dusk, Furka Pass, Canton Uri, Switzerland, Europe

Hiker with flashlight admiring the starry sky with Aurora Borealis (Northern Lights) standing in the middle of an empty snowy road, Levi, Kittila, Lapland, Finland, Europe

Hiker with backpack enjoying watching the Aurora Borealis (Northern Lights) over frozen trees, Riisitunturi National Park, Posio, Lapland, Finland, Europe

Tourist admiring the ice sculptures lit by moon standing in deep snow, Riisitunturi National Park, Posio, Lapland, Finland, Europe

Hiker admiring the sky with Aurora borealis (Northern Lights) standing in the frozen forest, Riisitunturi National Park, Posio, Lapland, Finland, Europe

A Diver observing a Giant sea fan (Annella mollis) and the Glass fish (Parapriacanthus ransonneti) that have used its cover as a safe haven. Sharm El Sheikh, South Sinai, Red Sea, Egypt.

A Diver observing a Giant sea fan (Annella mollis) and the Glass fish (Parapriacanthus ransonneti) that have used its cover as a safe haven. Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Thanks to a flashlight, the doctor can assess the state of the eyelids and the eye (conjonctiva, iris, pupil, transparency of the cornea) test the pupillary relfex (narrowing of the pupil reacting to light).

Light therapy lamps emit white light imitating daylight. They are used, between among other things, to fight against seasonal affective disorder.

Man with headlamp standing in front of tent lit from inside, moonrise, Askja volcano, Icelandic highlands, Iceland, Europe

Ski tourer with headlamp in front of Heidelberger Huette, dawn, Silvretta, Graubuenden, Switzerland, Europe

Man with flashlight at Oak (Quercus) on the Roethelberg with starry sky at night, tree, silhouette, Hohen-Demzin, Mecklenburg-Western Pomerania, Germany, Europe

Green glowing tent under the Milky Way with light traces of a flashlight, starry, Diedamkopf in the Bregenzerwald, Vorarlberg, Austria, Europe

A man camped on the summit ridge after climbing Thunderbolt Ridge in Hogum Fork while on a backcountry ski tour in Little Cottonwood Canyon, Lone Peak Wilderness, Uinta-Wasatch-Cache National Forest, Salt Lake City, Utah.

An observer watching the aurora borealis points his flashlight into the sky beside a campfire on Jarvis Creek in Delta Junction; Alaska, United States of America

Divers are framed by the twin openings at a dive site known as Skull Cave off the Kona coast of the Big Island, Hawaii, United States of America

Diver and a well camouflaged Commerson's frogfish (Antennarius commersoni) perched at the bow of the wreck of the Alma Jane off Sabang Beach, Puerto Galera, Mindoro, Philippines.

The silhouette of a diver in front of the sun, from below looking up at the surface, Yap, Micronesia