Hard backlight with zero fill — creates edge separation and moody silhouettes. Noir standard; separates subject from background through shape alone.
Strong backlight without front fill — that's the core idea, and it works brutally effectively if you know what you're doing. The camera sees a figure, outlined by hard light from behind, while the face or the front of the body remains in shadow or is only minimally modeled. No fill light to soften the shadows. The light works against you, not with you — and that's exactly the point.
In practice, you place a strong key light source behind or to the side behind your subject. The scene in front remains dark or is only lit by ambient light. The viewer sees contour, hair light, possibly sharp edges — but the face remains enigmatic, hidden, threatening. This works so well in psychological thrillers or film noir because the eye unconsciously searches for details it cannot find. The tension lies in this lack.
Technically, you need control: a strong spotlight in the back (often a 2.5K or 5K HMI, depending on the distance), flags and barndoors to control flare and keep the light focused. Without fill, your lighting ratio quickly becomes 10:1 or higher — very high contrast. Your camera needs to be able to handle this; with digital systems, you need to pay attention to the highlights. Film is more forgiving because the grain in the dark preserves dimensionality.
Common mistake: Beginners then add a fill light because they get nervous that the face isn't visible. Trust the composition. A silhouette with strong backlight is *complete* if the rest of the frame is working — the environment, the movement, the cuts. The film Blade Runner 2049 or early Kubrick works show how powerful this omission can be.
Related are contrast lighting and rim lighting, but they have different intentions: this is about radical concealment combined with formal beauty. NFB lighting only works if your story supports it — not as a pure design exercise, but as a dramaturgical tool.