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2. Halo (optical phenomenon) - Wikipedia

   en.wikipedia.org/wiki/Halo_(optical_phenomenon)

   A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk') [ 1] is an optical phenomenon produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky.

3. Sprite (lightning) - Wikipedia

   en.wikipedia.org/wiki/Sprite_(lightning)

   A sprite at the horizon, with lightning below in the troposphere and above the green line of airglow at the upper mesopause and border to space (the bright light above is the Moon). First color image of a sprite, taken from an aircraft. A sprite over Laos, as seen from the International Space Station. Sprites appear as luminous red-orange flashes.

4. Halo (religious iconography) - Wikipedia

   en.wikipedia.org/wiki/Halo_(religious_iconography)

   A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk'; [ 1][ 2] also called a nimbus, aureole, glory, or gloriole ( Latin: gloriola, lit. 'little glory') is a crown of light rays, circle or disk of light [ 3] that surrounds a person in works of art. The halo occurs in the iconography of many religions to indicate holy or sacred ...

5. Halo headlights - Wikipedia

   en.wikipedia.org/wiki/Halo_headlights

   Halo headlights (also known as halos, corona rings or angel eyes because of the distinctive arrangement of lights placed in a circular pattern) are automotive front lighting units with luminous rings inside the headlight assembly. Introduced in 2000 by BMW, halos were originally typical of this automaker's cars [ 1] but soon became a popular ...

6. 22° halo - Wikipedia

   en.wikipedia.org/wiki/22°_halo

   A 22° halo is an atmospheric optical phenomenon that consists of a halo with an apparent diameter of approximately 22° around the Sun or Moon. Around the Sun, it may also be called a sun halo. [ 1] Around the Moon, it is also known as a moon ring, storm ring, or winter halo. It forms as sunlight or moonlight is refracted by millions of ...

7. Backlighting (lighting design) - Wikipedia

   en.wikipedia.org/wiki/Backlighting_(lighting_design)

   In lighting design, backlighting is the process of illuminating the subject from the back. In other words, the lighting instrument and the viewer face each other, with the subject in between. This creates a glowing effect on the edges of the subject, [1] while other areas are darker. The backlight can be a natural or artificial source of light.