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Filmmaking Dictionary: Letter C / Cyc Light
What Is a Cyc Light?
A cyc light is a fixture designed to illuminate a cyclorama, backdrop or other broad surface with a controlled wash. Many use an asymmetric distribution: the light is spread differently in different directions to help cover the surface from a position near its top or bottom.
“Cyc” describes the application, not one light-source technology. Tungsten and LED cyc fixtures exist, and LED models vary in colour control, output and dimming behaviour. A cyclorama is the background itself; the cyc light is equipment used to illuminate it.
Why the Beam Is Often Asymmetric
A fixture close to the bottom of a wall must reach both the nearby floor area and more distant parts of the background. A simple symmetrical flood may leave a bright patch near the fixture and a weaker wash farther away. Cyc optics redistribute output to suit that geometry.
This does not make placement irrelevant. The fixture’s distance from the surface, its orientation and the height being covered all affect the result. Follow its photometric and spacing guidance, then judge the actual installation.
Building an Even Wash
- Start with the area visible in the widest planned frame, including any camera move.
- Place compatible fixtures with enough overlap to avoid obvious bright and dark bands.
- Evaluate the bottom, middle and top of the surface rather than checking one spot.
- Check joins between neighbouring fixtures and colour consistency across the wash.
- Look again after performers, props and foreground lighting are in position.
A row that looks smooth to the eye can still show unevenness through the camera. Use the intended exposure, white balance and viewing transform when making the final judgement.
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Lighting the Background and the Subject
A cyc wash and the subject’s key light have different jobs. Treating them separately gives the cinematographer more control over brightness, contrast and colour. Subject placement and flags can help prevent one setup from unintentionally changing the other.
With a white background, simply adding more light is not always an improvement. Excessive background brightness can create flare, lower contrast or produce unwanted spill on the subject. With green screen, the aim is an appropriate, consistent keying surface rather than the brightest possible green.
Colour, Dimming and Camera Checks
Test the required colours and brightness levels, especially if several fixture types are mixed. Matching a displayed colour setting does not guarantee identical recorded colour. Check for visible differences, unwanted shadows and reflections on nearby glossy surfaces.
Run a camera test at the planned frame rate and shutter setting. A dimming cue that looks smooth in the room may reveal flicker or stepping in the recording. Test the actual operating levels and any transitions used during the scene.
A Practical Example
For a full-length studio interview, the lighting crew first establishes a consistent background across the subject’s intended movement. They then light the person separately and check whether that key introduces a shadow or bright patch on the cyc. The final review includes both the wide shot and the tighter framing.
A conventional fixture may also light a cyc successfully. The advantage of a dedicated cyc light is its distribution and coverage for that task, not an automatic guarantee of a flawless background.
Frequently Asked Questions
Is a cyc light always an LED fixture?
No. The term includes different source technologies. Check the actual fixture for power, colour and control capabilities.
Can one fixture cover an entire cyc?
That depends on the size of the surface and the fixture’s coverage. Larger backgrounds commonly need overlapping fixtures or a different lighting arrangement.
Does a white cyc have to be overexposed?
No. Its recorded brightness is a creative and technical choice. Use the exposure required for the intended image without needlessly increasing spill or flare.
Related Terms
- Cyclorama — the continuous studio background.
- Green Screen — a coloured background used for compositing.
- Key Light — the principal source shaping a subject.
- Gaffer — the head of the lighting department.
- Flicker — unwanted variation in recorded light output.
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