Lighting Glossary

Plain-English definitions for every lighting term you'll encounter when using NGW or setting up a portrait studio.

Ambient light: Any existing light in the scene that isn't from your artificial sources — daylight through windows, overhead room lights, street lamps. In studio work, ambient is usually kept dark so flash controls exposure. In natural-light work, ambient is your key light.
Aperture: The opening in your lens that controls how much light reaches the sensor. Measured in f-stops (f/2.8, f/8, f/11). In flash photography: wider aperture (lower f-number) = more flash exposure. Flash and aperture are directly linked; shutter speed controls ambient.
Backlight: A light placed behind the subject, aimed toward the camera. Creates rim or hair separation, or silhouette effects. Also called a rim light when positioned behind-and-to-the-side.
Barn doors: Four adjustable metal flaps that attach to a light fixture. Used to control spill — restricting where light falls in the scene. Commonly used on background lights or to keep light off a white wall when shooting low-key.
Beauty dish: A round, shallow reflective dish with a small plate in the centre that blocks direct light. Produces a hybrid quality — harder than a softbox, softer than bare strobe. Distinctive ring-with-dot catchlight. Used at 2–4 ft from the face for skin detail with controlled shadow edges.
Broad lighting: When the lit side of the face is turned toward the camera. The shadow side is away from camera. Creates a fuller, wider appearance. The opposite of short lighting. Less commonly used for portrait work — short lighting is preferred for most subjects.
Catchlight: The small reflection of the light source visible in the subject's eye. Catchlights add life and dimension — a portrait without catchlights can look flat or lifeless. The shape of the catchlight reveals the modifier: softbox = rectangular, octabox = circular, ring flash = full ring, beauty dish = ring with centre dot. NGW uses catchlight position to identify key light height.
Color temperature: Measured in Kelvin (K). Lower values are warmer (orange/amber); higher values are cooler (blue/white). Daylight ≈ 5500K. Flash ≈ 5600K. Tungsten ≈ 3200K. LED varies. Matching your white balance to the dominant source prevents colour casts.
Diffusion: Material (usually white fabric or translucent plastic) placed in front of a light source to spread and soften it. Used in softboxes, umbrellas, and scrims. More diffusion area = softer shadows.
Falloff: How quickly light intensity decreases with distance. Controlled by the inverse square law: double the distance, lose two stops of light. Close lights have fast falloff (subject brighter than background); distant lights have gradual falloff (more even exposure across depth).
Feather: Rotating the modifier so that the edge of the beam — rather than the hot centre — illuminates the subject. The edge of a softbox or umbrella produces gentler, more even light than the centre hot spot. Feathering also reduces the chance of spill onto unwanted areas.
Fill light: A secondary light source (or reflector) that reduces the depth of shadows created by the key light. The fill doesn't add its own shadows — it just opens up the dark side. Power is set below the key light, typically 1–3 stops, to control contrast.
Fill ratio (light ratio): The power relationship between the key light and fill light. A 2:1 ratio is gentle and flattering. 4:1 is dramatic with clear shadow depth. 8:1 is very dramatic. Most portrait work sits between 2:1 and 4:1. The ratio determines the overall contrast of the final image.
Flag: A black panel or card used to block or shape light. Prevents spill onto backgrounds or into camera. Also called a gobo when used between lights and the subject, or between the subject and background.
Flash sync / sync speed: The fastest shutter speed at which the camera's shutter is fully open when the flash fires. Typically 1/160s to 1/250s depending on camera model. Exceeding sync speed causes a black band across the image. High-speed sync (HSS) allows faster speeds at reduced power.
Gobo: Any object used to block light. In portrait lighting: a black flag between the light and camera to prevent lens flare, or between the subject and background to control spill. The term comes from "go between."
Grid / Honeycomb: A mesh accessory that attaches to a softbox or modifier opening. Narrows the beam angle without changing the light quality — gives directional control without reducing softness. A 40° grid has a wider spread; a 10° grid is very tight and directional.
Hair light: A light positioned above and slightly behind the subject, aimed at the top of the head and shoulders. Adds dimension and separation from the background. Should not spill onto the face — often controlled with a grid or barn doors. Also called a separation light.
Hard light: Light from a small or distant source that produces crisp, defined shadow edges. Bare strobe, direct sun, and bare speedlight are hard sources. Smaller apparent source size = harder shadow edges. Hard light is not "bad" — it creates dramatic depth and texture.
Inverse square law: Light intensity decreases with the square of the distance. Move a light from 4 ft to 8 ft (double the distance) and you lose 2 stops of light — not 1. Practical implication: lights close to the subject have fast falloff; lights far away produce flatter, more even illumination across depth.
Key light: The dominant, primary light source in a setup. It determines the shadow pattern, establishes exposure, and defines the overall look. All other lights are set relative to the key. Set the key first; everything else is adjusted to complement it.
Light ratio: See Fill ratio. The ratio of key-side illuminance to fill-side illuminance. Expressed as key:fill (e.g., 3:1). A 3:1 ratio means the lit side receives 3× more light than the shadow side — equivalent to about 1.5 stops difference.
Modifier: Any attachment that changes the quality, direction, or spread of a light source. Softboxes, octaboxes, umbrellas, grids, snoots, barn doors, and beauty dishes are all modifiers. The modifier choice is one of the most important decisions in a lighting setup.
Octabox: An eight-sided softbox producing a slightly rounder, more circular catchlight than a rectangular softbox. Often preferred for beauty and portrait work because the circular shape better matches the human eye. Sizes range from 24" (tight, hard) to 7 ft (very soft, wrapping).
Power stop: A doubling or halving of light output. Each full stop either doubles (brighter) or halves (dimmer) the light. If your key is set at 1/4 power and you drop one stop, you're at 1/8 power. Fill lights are typically set 1–2 stops below the key to control the light ratio.
Reflector: A passive fill device — any surface that bounces existing light back onto the subject. 5-in-1 collapsible reflectors use silver (punchy fill), white (neutral fill), gold (warm fill), and black panels. No power required. Commonly used to open shadows when shooting with a single light source.
Rim light: A light positioned behind and to the side of the subject that creates a bright edge along the shoulder, hair, or cheekbone. Separates the subject from the background and adds depth. Also called a kicker when used more to the side. Hair light is a variant positioned directly above.
Scrim: A translucent panel placed between a light source and the subject to diffuse and soften it. Can be a silk fabric frame outdoors, or a smaller panel in studio. Diffusion scrims reduce intensity slightly while softening shadow edges.
Short lighting: When the shadow side of the face turns toward the camera — the lit side is turned away. Creates a narrower face appearance and more depth/drama. The most common orientation for portrait work. Contrast with broad lighting.
Snoot: A tube or conical attachment that restricts light to a very tight, focused beam. Used for hair lights, background spotlights, or accent lighting on small areas. The tighter the snoot, the more focused the beam.
Softbox: A box-shaped modifier with a white interior and diffusion panel at the front. Produces soft, even light with gradual shadow transitions. Rectangular softboxes produce rectangular catchlights. Larger softboxes = softer light relative to subject distance. Strip softboxes (tall and narrow) are used for rim and background lights.
Soft light: Light from a large source relative to the subject distance — produces gradual, feathered shadow edges. Large softboxes, umbrellas, and window light are soft sources. The apparent source size determines softness — a large softbox moved far from the subject effectively becomes a smaller, harder source.
Speedlight / Flash gun: A portable, battery-powered flash unit that mounts on or off camera. Lower output than studio strobes but highly portable. Most accept modifiers via adapter brackets. TTL (through-the-lens) metering automates exposure; manual mode is preferred for consistent studio work.
Strobe / Monolight: A studio flash unit — either a monolight (self-contained head) or a strobe pack system (separate head and power pack). Much higher output than speedlights. Consistent colour temperature. Monolights (Profoto B10, Godox AD300) are the standard for portable studio work.
Umbrella: A collapsible modifier. Shoot-through umbrellas diffuse light directly through white fabric. Reflective umbrellas bounce light from the inside surface. Generally produce softer, less directional light than softboxes. Lower cost and faster to set up, but less controllable (more spill).
V-flat: Two large (4×8 ft) foam board panels hinged together in a V shape. One side white (reflector/fill), one side black (negative fill/flag). White side opened near the subject fills shadows. Black side creates deeper shadows by absorbing instead of reflecting. A fundamental studio tool for controlling contrast without adding powered sources.
White balance: A camera/post-processing setting that calibrates how the sensor records colour temperature. Correct white balance makes neutral surfaces appear neutral. Flash = Daylight (5500K) preset. Tungsten = 3200K preset. Auto white balance (AWB) adjusts per-frame and can cause inconsistency across a shoot.

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