While not present in the actual film (unless you count the ice and snow), the most common poster for The Thing (1982) depicts a man with a white radiance emanating from and obscuring his face, implying he was assimilated.
In The Man with the Golden Gun, Francisco Scaramanga wears a white suit for most of the film's second act. Although he briefly earlier weared a black suit, his white suit is his most iconic outfit from the film, as he always wears it when he appears as a playable character in James Bond videogames.
In Masters of the Universe, when Skeletor absorbs the power of the Great Eye, he transforms into a golden-armored warrior god with golden powers.
In The Prophecy, the allegedly good angels like Gabriel and Uriel, who express affection abundantly, love kids and can't stand to see people cry, are the villains on an anti-human crusade to destroy and rebuild heaven as it was before the creation of man. The devil has to offer his aid to the humans who end up getting involved in the war (which he does for his own ulterior reasons).
The main villain of the Constantine movie. While the halfblood Gabriel turned out to be the main cause of the problems, Lucifer (Satan) was dressed in an immaculate white business suit and yet was not the major villain.
There was that black goo clinging to his feet, though....
Though you can take it as a moment of Fridge Brilliance, since Satan was once an angel who was cast out of Heaven. It's a fitting look for a sullied angel.
In Night Watch and Day Watch, the good guys are called Night Watchers, while the bad guys are called Day Watchers. This is because the Night Watch are the side of the Light Others, whereas the Day Watch are the side of the Dark Others. The names are literal; Night Watch keeps a watch on the dark, and Day Watch keeps a watch on the light. The books and movies make it clear that when you get down to it, both sides are just people with jobs, and the Night Watch have quite their share of dicks.
Sunshine (2007). As the Icarus II gets closer to the Sun, the latter begins to take on the impression of an all-powerful god, and not a friendly one either. Several people, notably psychiatrist Searle and the Nietzsche Wannabe villain, are affected.
Then there's Galadriel showing why giving her the One Ring would be a bad idea:
Evil!Galadriel: And now at last it comes. You will give me the Ring freely! In place of the Dark Lord you will set up a Queen. And I shall not be dark, but beautiful and terrible as the Morning and the Night! Fair as the Sea and the Sun and the Snow upon the Mountain! Dreadful as the Storm and the Lightning! Stronger than the foundations of the earth. All shall love me and despair.
Saruman the White, as listed in the literature section. Though he isn't particularly nice looking and is surrounded by dark forces, he still has some light related symbolism, most notably in the scenes where Gandalf (then Gandalf the Grey) is present.
In the realm only perceivable by those wearing The One Ring, the Nazgul appear as bone white harbingers of death (in contrast to their typical black shrouded profiles most everyone sees).
In Dragonheart, King Einon always dresses in white. In contrast, hero Bowen is dressed in black.
The Golden Compass seems to love this trope, to the point that Mrs Coulter (who was black haired in the books) became blonde (to which the author said: "I was clearly wrong. You sometimes are wrong about your characters. She's blonde. She has to be."), and intercision is not done with a blade as in the books, but with lasers.
Transformers: Soundwave's robot mode vaguely resembles an angel. His satellite mode (well, at least the toy version) also continues this theme somewhat.
And his car mode in Dark of the Moon as well.
Daybreakers: When Edward Dalton parks his car under a tree in the full heat of the day, the whole scene does a great job at equating light with fear.
When we are introduced to the Big Bad in Heroic Trio, he is wearing a gold, glittery outfit and is illuminated in the middle of a dark lair.
Poltergeist - '"Don't go into the light', Carol Ann!". In this case, the light is not good for Carol Ann because she is a living girl sucked into the beyond. The light however is good for the spirits hovering around there. Going into the light allows them to leave their bitterness behind.
Commodus, the villainous emperor in Gladiator, wears a pure white gown while battling the hero Maximus, in dark armor, during the final battle.
In a rather bizarre scene from Gordy, the villain is shown with a heavenly, golden glow around him as overlaid footage of what he believes is sabotaged clips of the title pig is being shipped off.
The white-suited humans in their clean, sterile towers in Oblivion (2013) . Sure, they're more-or-less good people, but they're unwittingly maintaining the Tet's ongoing obliteration of humanity. Similarly, the shiny, white, disturbingly Trigger HappyAttack Drones.
X-Men: First Class: Emma Frost, who is (scantily) clad in white and can turn her body into a mass of shining diamonds, but has no discernible morals.
X-Men: Apocalypse: Archangel with his angelic motif and being a Horseman of Apocalypse.
The Hunger Games: The Peacekeepers wear pristine-white helmets and armor. Capitol, the heart of the decadent Panem, is an imposing Shining City. Even the rooms in the participant's rooms have bright white crystalline lights.
In The Hunger Games: Mockingjay Part 1, compared to District 13, the Capitol has its people dressed in bright lavish colors, the President is named after white snow, and its Peacekeepers wear bone white armor, but the Capitol is anything but good.
Frank Nitti, Al Capone's hired assassin from The Untouchables wears a pure white suit.
In Alien Abduction (2014), the presence of the aliens is marked with a blindingly bright light glaring out of the darkness in pursuit of the fleeing family.
Mehmet II from Dracula Untold. When he fights Vlad, he is surrounded by silver coins, wields a silver sword, and dresses in bright gold armour. This is still the same guy who demanded a thousand boys to use as soldiers. The silver is justified by being a vampire's weakness.
In The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe: Much like in the book, the White Witch wears pure white and is a Satanic Archetype. Also in the movie, in the final battle her chariot is pulled by polar bears and she has white tigers as minions, contrasting Aslan who has a grizzly bear and various great cats (including regular tigers) on his side.