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[[quoteright:350:[[Film/HarryPotterAndTheDeathlyHallows http://static.tvtropes.org/pmwiki/pub/images/rsz_harrypotterlumos_9348.jpg]]]]

->''But mysterious caves and tunnels always have luminous fungi, strangely bright crystals or at a pinch merely an eldritch glow in the air, just in case a human hero comes in and needs to see in the dark. Strange but true.''
-->-- '''Creator/TerryPratchett''', ''Discworld/MenAtArms''

You can't expect all sorts of media to have flashlights, or other sources of light that runs on batteries, for characters to use in dark areas, so there's either {{Hollywood Torch}}es or the Fantastic Light Source to use. Perhaps its due to {{glowing gem}}s. Sometimes you can expect [[GlowingFlora luminescent flora and fungus]] in particular. Also the MundaneUtility of PowerGlows or those with [[LightEmUp Light]] ElementalPowers. Either way, it's almost always guaranteed to [[InfiniteFlashlight last indefinitely]].

See HollywoodDarkness, for when no explanation is given for all the light and visibility on the scene.



[[folder:Anime & Manga]]
* Early in ''Manga/CrimsonSpell'', Halvir gives Prince Vald a fairy in a jar to use as a light source, instructing him to smack it and make the fairy angry to make it glow. Vald, who is a nicer person than Havi is, sets the fairy loose as soon as Havi has left.
* In ''Manga/KamichamaKarin'', Karin once uses her [[PowerGlows glowy]] [[RingOfPower magic ring]] as a flashlight.
* Chapter 8 of ''Manga/MagicalRecordLyricalNanohaForce'' shows that mages in the setting have a spell that creates floating orbs of light that serves as this when they need to work at night in places away from civilization, such as when [[spoiler:paramedics were carting away Signum after her battle against Cypha [[NearDeathExperience left her in critical condition]]]].
* ''Manga/{{Naruto}}'': Naruto's Super Mode, which calls on the uncorrupted Ninetails chakra, is used as a flashlight, which is then properly [[LampshadeHanging lampshaded]].
* Shinsoo in ''Webcomic/TowerOfGod'', due to the trope PowerGlows.
* In ''LightNovel/TheSlayers'', the Light spell is so simple even someone with zero magic potential can learn it. This is used to show how little people outside of the Barrier know about magic, as their version of a wizard can do the light spell, and nothing else.

[[folder:Fan Works]]
* In ''Fanfic/WithStringsAttached'', after Paul becomes able to cast the light spell he learned, he serves as the walking, talking Fantastic Light Source for the four.

[[folder:Films -- Animation]]
* The ant colony in ''WesternAnimation/ABugsLife'' uses luminescent mushrooms as lighting.
* On ''WesternAnimation/DespicableMe'', one of the Minions is used as a glow stick.
* In ''Disney/{{Tangled}}'', Rapunzel uses her magic hair to find the way out of a flooded cave.
* Due to the fact he glows in the dark, Buzz is used as a source of light for the other toys in a scene in ''WesternAnimation/ToyStory3''.

[[folder:Films -- Live-Action]]
* ''Film/{{Avatar}}'': the biolumiscent flora of Pandora.
* Occurs at the climax of ''Film/PitchBlack'' with the [[spoiler:glowing worms]] found in a cave. The [[spoiler:worms]] help keep the light-sensitive monsters at bay long enough to allow [[spoiler:the survivors to make it to the shuttle]] at the end.
* ''Film/GuardiansOfTheGalaxy'':
** Groot, a PlantPerson, is able to produce bio-luminescent spores from his body.
** Peter Quill uses a glass-like orb of light when exploring a ruin. In a pinch, it's also quite effective at [[DisintegratorRay disintegrating people]] when shattered.

* ''Literature/ShadowsOfSelf'' has a bioluminescent fungus that grew in the cave system [[PhysicalGod Harmony]] created from various places underground, personally cultivated so that no one who lived there would ever have to live in darkness again.
* The ''Literature/ColdfireTrilogy'' has the Fire briefly wielded by Damian in the first book [[spoiler:before Calesta tricked Senzei intro drinking it, resulting in Senzei's death and the loss of the Fire]] and the coldfire wielded by the Hunter. The Fire was the last remaining sample of tamed solar fae bound to water with the prayers of thousands. Solar fae, unlike others, can only be tamed through massive collective effort and belief, and faith in the present is no longer strong enough to do so. It's a handy light source that is also anathema to any creature of the darkness. Coldfire is a "flame" that is as cold as true fire is hot (and just as dangerous) that gives off an eerie blue light. The Hunter wields a sword imbued with tamed fae that radiates coldfire as his weapon of choice.
* Literature/{{Discworld}}:
** ''Discworld/MenAtArms'' lampshades this, when two characters that can see in the dark fall in a tunnel, but the narration points out, that for the benefit of viewers and to fit conventions there are fluorescent fungi on the walls giving it a slight blue tint.
** ''Discworld/TheLastContinent'' also lampshades this in a similar situation, with the lighting being provided by glowing rocks.
** And in ''Discworld/{{Thud}}'', the dwarf mine is lit by vurms, [[BioluminescenceIsCool bioluminescent]] carrion-eating creepy-crawlies.
* ''Literature/DragonBones'' has glowing rocks, which are implied to have been made by dwarves.
* In ''Literature/TheDresdenFiles'', Harry often uses magic to light up his pentacle amulet. Though it's a modern setting, Harry's amulet is more reliable because technological lighting often fails when magic's afoot. He also occasionally uses faith magic to light up his pentacle which has the secondary ability to repel those weak to faith.
* ''Franchise/{{Dune}}'' has glowglobes, free-floating lamps equipped with antigravity generators. Like many other aspects of the Duniverse, they have also been borrowed by ''TabletopGame/{{Warhammer 40000}}''.
* ''Literature/HarryPotter'':
** Wands can generate light with the Lumos spell. It's either allowed or undetected by the underage-magic-detecting Tracer due to either its simplicity or its nondescript nature: it's easy for a Muggle to mistake the lit wand for an ordinary flashlight.
** The Deluminator (or Put-Outer) device, one of Dumbledore's inventions, has the opposite effect: when activated, it steals the light away from nearby sources[[note]]it doesn't have to be a dedicated light source either, as Ron once clicked it in a pub and the TV turned off[[/note]]. The trapped light can be carried around and released as suspended balls of light.
* ''Literature/LabyrinthsOfEcho'' has fungi in fishbowls that emit pleasant orange light when irritated (the switch is connected to little brushes). And magical luminescent lamps for blue light.
* The book ''The Last Dragonlord'' had dragonfire, orbs of harmless and seemingly cold fire that gave off light.
* Both the Phial of Galadriel and Gandalf's staff serve this purpose in ''Literature/TheLordOfTheRings''.
* Princess Eilonwy's "bauble" (AKA the [[http://en.wikipedia.org/wiki/Golden_Pelydryn Golden Pelydryn]]) in ''Literature/TheChroniclesOfPrydain''.
* In the Franchise/StarWarsExpandedUniverse novel ''Literature/SplinterOfTheMindsEye'', when Luke and Leia enter a series of caves, they discover it isn't totally dark due to a light-emitting fungus growing on the walls.
* ''Literature/TheStormlightArchive'' has glass spheres with gemstones in the center infused with the titular Stormlight used as lamps, they provide a steadier light than oil lamps or candles, and can be easily recharged by leaving the spheres out in a [[HostileWeather highstorm]]. They are [[PracticalCurrency also used as money]], and so using them as light sources is seen as a sign of wealth. In [[AllThereInTheManual Arcanum Unbounded]], a scholar theorizes that this is at least partly due to the fact that the planet has a higher oxygen concentration than most worlds. While in modern times the people understand fire enough for it to be safe, in pre-history it was likely too dangerous to be used as a casual light source, leading to the ubiquity of the safer gemstones.
* Channelers in ''Literature/TheWheelOfTime'' can conjure spheres of light.
* Trolls from ''Literature/MaledictionTrilogy'' do not use any external light sources in their city (which is very convenient, since it is buried under the mountain, so fuel is scarce and smoke would be a problem). Each pure-blooded or mixed-blood troll is capable of creating a small light that follows them at all times. They can also infuse glass objects with their light and even provide them with a switch-on[=/=]switch-off capability.
* In the ''Literature/YoungWizards'' series, caves where wizards are likely to have adventures tend to be lit with "fire fungus". The arbitrariness is lessened a bit by implying that the glowing fungus is part of a whole ecology of magical underground life; for one thing, it's what the [[TheDarknessGazesBack little creatures that skitter through the shadows and watch with glowing eyes]] live on.
* ''Literature/{{Below}}'' has several magic sources of light. There's the daybreak spell, which creates a full artificial day. But spell lamps are this world's equivalent to the light bulb, made of enchanted scrap glass and fueled by liquid magic ''esen'' drawn through wire wicks, which cast white light like the sun. The party carries a few of these. [[DungeonCrawling The ruins]] contain a few self-replenishing lamps that have remained active for many centuries.

[[folder:Live-Action TV]]
* The LivingShip ''Series/{{Lexx}}'' has bioluminescent internal organs.

* Music/LindseyStirling's [[http://www.youtube.com/watch?v=inb8MMZ-QmA "Song of the Caged Bird"]] video includes this. After unpacking many lightbulbs and candles, all dark, she finds a violin in a crate and begins to play. The candles light up slowly until the room is very bright, though they are dependent on her continuing to make music. At the end, her violin starts to glow too.

[[folder:Puppet Shows]]
* The reason the caverns in ''Series/FraggleRock'' are so brightly lit is because of Ditsies; creatures that feed off music and turn it into visible light.

[[folder:Tabletop Games]]
* ''TabletopGame/DungeonsAndDragons'':
** Older editions had objects with Continual Light cast on them. Some were shaped in useful ways, such as balls (could be rolled into the darkness) or "frisbees" (could be thrown). Someone even came up with a Continual Light flashlight/lantern (could be opened to let the light out).
** 3[[superscript:rd]] Edition added Sunrods as a standard item.
** 3[[superscript:rd]] Edition lets {{Alchem|yIsMagic}}ists distill sunlight into a liquid that glows perpetually -- and [[WeakenedByTheLight sets undead on fire]].
** Dwarves of ''TabletopGame/ForgottenRealms'' use jars with [[http://www.wizards.com/default.asp?x=dnd/es/20030108es glowing borer-worms, glowmoss and phosphorescent powders]]. Glowmoss is also a stock light source in ''TabletopGame/{{Spelljammer}}'' (fire is out of question in the Flow).
* D&D's spiritual successor ''TabletopGame/{{Pathfinder}}'' formally added a common player-made item, the Ioun Torch: a small crystal that floats around its owner's head with a Continual Light spell, granting safe, perpetual, hands-free illumination.
* FASA's ''TabletopGame/{{Earthdawn}}'' had magical "light crystals".
* ''TabletopGame/{{Exalted}}'':
** One of the most common elements retained from the former Ages is the use of Essence-based lighting.
** Many types of Exalted also have the ability to light up their BattleAura to illuminate their surroundings. Some, like Solars and Lunars, have it easier than the others.
** There's even a five-dot hearthstone that illuminates quite a large area with natural sunlight, even if it's pitch dark. This is of course really, really bad for any hungry ghosts in the area.
* ''TabletopGame/AnimaBeyondFantasy'' has the "Lampyridae"[[note]]Latin for "firefly"[[/note]] stones. Once submerged in water, they shine so much that usually are used as street lights.

* ''Toys/{{Bionicle}}'':
** Lightstones are used by inhabitants of the Matoran Universe as a light source. Additionally, beings and other things relating to the Light [[ElementalRockPaperScissors element]] suffice, such as the Kanohi Avhokii, the Mask of Light.
** The [[UpToEleven Great]] Ruru ([[MaskPower mask of]] night vision) was demonstrated to be this in ''Legends of Metru Nui''.
** Additionally, there are Lightvines that grow in various locations.

[[folder:Video Games]]
* ''VideoGame/DistortedTravesty 3'' has a fairy as the cursor, among other things it acts as [[https://www.youtube.com/watch?v=jwWi8mx7doo a nifty light source.]]
* Besides torches and lanterns, ''VideoGame/{{Angband}}'' has the Phial of Galadriel, the Star of Elendil, and the Arkenstone of Thráin. These unique artifacts are all permanent light sources.
* The caverns of ''VideoGame/{{Avernum}}'' are lit by luminescent mold on the ceiling. Depending on who you believe, either [[VainSorceress Erika]] made it and propagated it, or the [[TheGrays Vahnatai]] did. Either way, it's a good thing it's down there--it's also what turns the caves' carbon dioxide into breathable air.
* ''VideoGame/DemonsSouls'': The player always has a magical gem called the "Augite of souls" which glows in the presence of souls.
* Luminite, in ''VideoGame/DevilMayCry'', is an Underworld mineral that suffers changes in the human world and starts [[InfiniteFlashlight emitting white light indefinitely]]. Dante collects a chunk and uses it as a lantern in the first game.
* In ''VideoGame/EverQuest'', [[WillOTheWisp will'o'wisps]] drop light stones and greater light stones, which help adventurers see in the dark.
* ''VideoGame/GodOfWarIII'': Kratos rips off Helios' head to use it as a lantern. It can also reveal hidden chests.
* In ''VideoGame/GrimFandango'', you meet a character who's fashioned a lantern out of luminescent coral and attached it to his scuba-suit. You use him to traverse the dark ocean floor by [[spoiler:getting Glottis to pick him up and carry him with you.]]
* ''VideoGame/HalfLife'':
** In the Xen segments of ''VideoGame/HalfLife1'', there are bio-luminescent stalks which retract and turn off when approached.
** Xenium crystals are also luminescent, as seen in ''Blue Shift''.
** ''VideoGame/HalfLife2'' has [[BigCreepyCrawlies Antlion]] larvae, glowing blue (very young) or yellow (older). Antlion Guardians also glow greenish, though this is intended as a warning to their potential prey that the car-sized LightningBruiser [[OhCrap about to]] [[PunchedAcrossTheRoom send you flying]] with a [[UseYourHead headbutt]] [[HPToOne has neurotoxins in its arsenal]].
* In ''VideoGame/{{inFamous}}'', Cole gets around the sewers by generating small amounts of electricity on his arms.
* In ''VideoGame/MetalGearSolid3SnakeEater'', Snake can eat luminescent mushrooms to power his Night-vision Goggles and other battery powered items. How though ... don't ask.
* ''Franchise/{{Pokemon}}'': the move Flash is used outside of battle to light up dark areas.
* ''VideoGame/PlantsVsZombies'': The Plantern is a nocturnal plant which glows and dispel the bank of fog around it.
* In ''VideoGame/BetrayalAtKrondor'', there are spells and magic artifacts to generate light at nighttime or in dungeons. This is very useful in the Naptha Mines in chapter 4, where lighting a torch will cause the whole place to explode.
* ''VideoGame/SwordOfVermilion'' has the Luminos spell, which lasts until you leave the dungeon you cast it in.
* In ''VideoGame/{{Touhou}}'', Wriggle Nightbug's butt emits light. She is a firefly, after all.
* ''VideoGame/UnrealI'' has Tarydium crystals, that glow a soft, watery blue that varies from very clear cyan to duke blue. The former occur naturally in the crystals, making caves and mine shafts some of the game's most well-lit areas, while the Nali like using the latter as wall lamps in the sleeping and bathing chambers of their more elaborate buildings, such as the Sunspire.
* In ''VideoGame/{{Xenoblade}}'', the [[RidiculouslyCuteCritter Nopon]] use the pollen orbs they manufacture in their village as both light sources and food (and in the case of red ones, a group sells them as [[BreadEggsMilkSquick a highly addictive drug]]).
* ''Franchise/TheElderScrolls'' series has several spells which generate temporary sources of light, typically classed in the [[MasterOfIllusion Illusion]] school of magic. Depending on the specific spell and the specific game you are playing, these balls of light may stick to you, float around and follow you, or stick to a surface that you cast them at. The drawback of these spells is that using them will make it easier for enemies to detect you. Related are the Night Eye spells, which provide temporary InnateNightVision and do not have this drawback.
* Some Diablo-inspired games have items with "light radius", which causes the circle of visibility around your character in dark places to be larger.
* Trapping fireflies or similar luminous insects and bottling them to create a light source is practically a trope of its own in light-hearted inventory-based adventure games.
* In ''VideoGame/{{Moss}}'', there's an unusual one that represents the player's cursor. It does in fact count as an in-game object, as it illuminates anything close to it.

[[folder:Web Comics]]
* When Tanna enters the temple in ''Webcomic/EarsForElves'', it's dark once she reaches the main room. However, [[http://www.earsforelves.com/archives/612 she touches an orb]] over a glowing basin, and it and similar orbs light up the whole chamber with mystical effects.
* Played with in ''Webcomic/GirlGenius'': a character questions why the Deepdown doesn't have phosphorescent crystals or fungi, and is told they were all sold. Later phosphorescent fungi are seen in the caverns beneath Castle Heterodyne and Paris.
* Denizens of the Basement in ''Webcomic/TheMansionOfE'' breed and use [[http://mansionofe.comicgenesis.com/d/20040914.html Glowing Balls Of Light.]]
* In ''[=RoomLand=]'', an ''Webcomic/MSPaintAdventures Forum Adventure'', the cave Mary-Beth lives in is lit up by some kind of glowing plant.
* In ''Webcomic/ThreePanelSoul'', a man wins Lucifer's soul in a game. He mainly uses it as a lantern.
* Eric from ''WebComic/TwoKinds'' has a spell that converts {{mana}} into light.
* ''Webcomic/{{Unsounded}}'' gives these a MundaneSolution. Since the FunctionalMagicSystem of Pymary can only manipulate existing Aspects of reality, luminous [[http://www.casualvillain.com/Unsounded/comic/ch04/ch04_42.html starflies]] are juiced and sold to spellcasters so they have a handy source of Light Aspect to draw on.

[[folder:Western Animation]]
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** The ability to make their horn tips glow is a basic spell that almost all unicorns seem to capable of, alongside telekinesis. It's easy enough that even a somewhat dim-witted foal like Snails can cast it (although it takes him some effort). Besides using this as a built-in flashlight of sorts, the light can be directed into a narrow beam that may or not project an image, as shown by Rarity, Twilight and a number of unicorn Royal Guards on various occasions. Regular flashlights also exist, but it's not said whether they're magic-based or electric.
** In "[[Recap/MyLittlePonyFriendshipIsMagicS6E26ToWhereAndBackAgainPart2 To Where and Back Again]]", the inside of the changelings' hive is lit by seemingly organic, bioluminescent green pods hanging like fruit from vine-like structures growing on its ceilings. These vines and lamp-like pods are only scattered and occasional in some areas and cover almost every inch of the ceilings in others, in which occasions they're also found growing on the walls and floors.
* The Gem race of ''WesternAnimation/StevenUniverse'' are sentient gemstones that construct their humanoid bodies out of HardLight. Following that they can use their gemstones as flashlights.
* In ''WesternAnimation/{{Mixels}}'', the [[ShockAndAwe Electroids]], being electric-based in their abilities, are able to use the purplish-blue electricity-holding parts of their bodies as flashlights.