Evil Is Not Well Lit

"Men have preferred darkness to light because their deeds were evil."

- John 3:19

Any scene location where the villains do their plotting is invariably dark. This includes, but is not limited to, starship command centers, unethical laboratories and throne rooms. A more personal effect is when the villain seems to absorb the light around him, presenting dramatic shadows that you could have sworn weren't there moments before the heroes arrived.

In some circumstances, it's obvious. The villains don't want to meet on the street, either to conspire or with a victim of Blackmail, or travel with their ill-gotten and conspicuous goods, or go into their stronghold, when it's broad daylight; people will see them. Night is necessary to hide. Also, they may not want the characters they are talking to to be able to recognize them, and gloom helps there.

But they don't turn on the lights once they're inside the stronghold and everyone knows them.

Some evil monsters require Always Night; sunlight can harm them, but it does produce this effect.

Interestingly enough, it has been produced in a lab: people are more likely to be dishonest/commit moral transgressions in a dark environment. Perhaps it is revealing What You Are in the Dark.

Often the setting for the Omniscient Council of Vagueness. Glowy orange or purple colors are optional. Compare Empathic Environment, Sliding Scale of Shiny Versus Gritty and Face Framed in Shadow. See also Dark Is Evil and Darkness Equals Death for why this trope is employed, and Chiaroscuro (and the page image) for another reason why. Compare AND contrast Daylight Horror and Light Is Not Good.

Anime and Manga

 * All evil plotting in Tsubasa Reservoir Chronicle takes place in almost complete darkness.
 * Alucard's room in Hellsing is particularly dark, although it could be said that not much of Hellsing could be considered bright.
 * Possibly justified because Alucard is a vampire, and vampires are typically nocturnal.
 * Higurashi no Naku Koro ni is interesting in that as the plot gets darker, so does the environment. Go on, see for yourself.
 * Father from Fullmetal Alchemist plays it straight with his dark subterranean throne room.
 * The Brotherhood anime, however, made the room much more bright.
 * The Seven Stars from Shikabane Hime.
 * The senators in Eureka 7. (Points for a dramatic green light in the center of the room.)
 * Akatsuki in Naruto were initially shown to meet in a really dark cave with only their outlines being (barely) visible.
 * Magical Girl Lyrical Nanoha has Precia and most of the areas in her Garden of Time.
 * In Death Note Light Yagami's room, where he does most of his evil planning in the earlier part of the anime, is always dark.

Comic Books

 * Played with in The Flash, where the Rogues typically do their plotting in a diner or bar, and once met in a movie theater.
 * Sin City is dark almost everywhere you go but then again, it's a bad place.

Fan Works
"L (to Light): Did you forget where the light switch was or are you endeavouring to save on our carbon footprint?"
 * In Tiberium Wars, this is invoked by Kane, because making his minions stumble around in the dark is funny.
 * Lampshaded in A Cure for Love: after L and Light have a fight (and L reflects that perhaps upsetting Kira like that was a bad idea) L returns to HQ to find Light sitting alone in the dark:

Film

 * Nero from the 2009 Star Trek movie has a particularly poorly lit ship.
 * The bridges of Klingon ships in earlier movies were also poorly lit, with a red tinge to the lighting. The Bounty shows us that Klingon starships don't have the wiring to be brighter inside.
 * Any number of Sith.
 * Before becoming the Emperor, Palpatine always appeared as Darth Sidious hidden in shadow to conceal his identity.
 * Averted with the Empire. The Death Star and Star Destroyers are all pristine clean and extremely well lit.
 * Except for Palpatine's throne room. Clearly he got a taste for it.
 * The evil owner of the baseball team from The Natural kept his office unlit. That led to a humorous scene when the hero turned on the light on his way out, and the team owner completely overreacted. (Roger Ebert complained about the opposite device in his review, saying that Robert Redford and Glenn Close were frequently lit like angelic beings, just in case you didn't know who to root for.)
 * Common in the Disney Animated Canon; villains almost always get a scene or two with low lighting.

Literature
"Whether it was day or night the king could not tell. The palace of King Tarascus seemed a shadowy, nighted place, that shunned natural illumination. The spirit of darkness and shadow hovered over it, and that spirit, Conan felt, was embodied in the stranger Xaltotun."
 * In The Truth, the evil conspiracy has their dimly lit room described so that it matches the trope well and points out a potential advantage of using it: If the room is badly lit but for one bright light, it's hard to make out anyone's face and learn his identity.
 * Lord Voldemort, aka the Dark Lord, is very fond of this trope. His favorite scenes for evil showdowns include an old graveyard (at midnight) and a vast chamber filled with snake statues built far underground. Also Slytherin house, which has a far greater ratio of mean students to nice ones, has a commons room that is noticeably dark and poorly lit compared to the commons rooms of the other houses.
 * Lampshaded by Dumbledore, who believes Voldemort is using the darkness and the death motifs to scare his enemies. From what we heard of Slytherin, he wasn't a very pleasant person, and the students who are enrolled in his house are usually very much like him, so it's somewhat justified.
 * Specifically averted in the third Honorverse book, The Short Victorious War, in which the future Committee of Public Safety, who have not yet carried out their coup, meet in a tennis court in an abandoned high-rise—but, while the windows are thoroughly blacked out, the inside is well lit. (Debatably Evil, at least at that point, but the same people become undebatably Evil later on.)
 * In Robert E. Howard's The Hour of the Dragon, Conan the Barbarian is taken to such a place.

"The Druids of his own isle of Erin had strange dark rites of worship, but nothing like this. Dark trees shut in this grim scene, lit by a single torch. Through the branches moaned an eerie night-wind. Cormac was alone among men of a strange race and he had just seen the heart of a man ripped from his still pulsing body"
 * In Robert E. Howard's Kull/Bran Mak Morn story "Kings of the Night", where the Religion of Evil performs its Human Sacrifice:


 * Averted, sort of, in The Man Who Was Thursday, when the Supreme Council of Anarchy meets over breakfast in broad daylight in a very public location. Of course, as with just about any other event in the novel, there's more going on than meets the eye.

Live-Action TV

 * Star Trek: Federation starships are definitely better lit than Romulan, Borg or Klingon ships (even after Klingons became good guys).
 * Stargate Verse: averted with the Goa'uld, the Ori and the Asurans, as all of them had pretty well lit ships. Played straight with Replicators and the Wraith. Seemingly inverted in Stargate Universe, as the Destiny (and presumably the other very old Ancient ships) is darker than the hostile alien ships were so far.
 * iCarly: Nevel's blackmail of Carly takes place in the dark dingy alley behind her and Freddie's apartment building.
 * This happens in Asfour, when Itzik is taken to meet Saragousti. Justified, as

Video Games
"Duke: Jeez, you'd think Morphix could afford a few light bulbs."
 * In Halo, Covenant ships and Flood buildings are dimly lit.
 * Though in the books that's explained as the lights being in the blue/violet range because that's the color that Elites' eyes were adapted to.
 * Count Bleck's Castle in Super Paper Mario is completely black, with only the walls, floor and other features bordered with white lines.
 * In the original Paper Mario, the two main rooms of Peach's Castle are a lot darker when under Bowser's control; this works out to Peach's benefit. Most of the side rooms are still well-lit, though.
 * In Paper Mario: The Thousand-Year Door, when you reach the room where the Shadow Queen appears, the plethora of candles go out, and a darker flame appears on each.
 * Taken to an extreme in Metal Gear: Ghost Babel; a spinoff for the Game Boy Color. The villain Marionette Owl can see well in dark areas.
 * Alan Wake's Dark Presence is not only this, but Not Well Lit Is Evil.
 * Morphix's GLOPP factory in Duke Nukem: Manhattan Project.


 * In The Sims 3 sims will get a negative moodlet without proper lighting. Sims with the evil trait won't.
 * In the Command & Conquer Tiberian series, Brotherhood of Nod bases tend to have very minimal, very stark red lighting, such that 80% of any given shot is black and the rest red (see the page pic for Dark Messiah for a typical example). The fanfic Tiberium Wars suggests this is entirely because Kane loves hearing his subordinates bang their shins on consoles.
 * In The Dark Meadow, monsters won't attack you in any room that has light coming in. (Although a little bit getting in through a crack is OK for them, apparently.)
 * The BlackCastle in An Untitled Story. Not only is it black, it also has a room with a faulty lighting.
 * In Wario Land Shake It, the throne room the Shake King stays in through about 90% of the game is literally completely dark. As in, the bit Wario enters from is pretty much just a black screen and the rest of it seems like only half the lights are on, to the point you can see the villain's eyes glowing in the dark.
 * In Don't Starve, you must keep a light source nearby at night, as Charlie can - and will - attack if you don't have one. And if that happens, she will kill you.

Webcomics

 * Subverted in Dan and Mab's Furry Adventures: Dan finds the Dark Pegasus plotting in a dimly-lit room, but it's not because he's evil - the power went out due to reckless damage caused by Dan's allies.
 * Kyran from Emergency Exit likes this, despite complaints about its impracticality.
 * Sluggy Freelance both plays straight and lampshades this one with sinister corporation Hereti-Corp, whose "Evil Room" is kept dark. Lampshaded in its initial appearance and again when the company is dismantled and its leaders take over a fast-food franchise from the bottom up. The rebuilt corporation of later years plays it straight.
 * Bob and George here and here
 * Lampshaded via a Running Gag in Pebble Version is the (presumably) Big Bad's search for adequate lighting in his office. When he did get a lamp, it was blindingly bright.
 * In Far From Home, lampshaded when the prisoners ask why and the captain answers it's for effect.

Web Original

 * In Legend of Neil, not only is Ganon's lair poorly lit, but also commonly under the effects of fog machines (fog = power], making it damn near impossible to find anything.
 * In The Fantastic Favio Bros, Dr. Lucifer parodies the trope by having his mansion be pitch black in his introduction. He then averts it when he falls down the stairs due to the darkness.