# What four properties of light do film-course texts teach (source, quality, direction, colour), what is motivated light, and how do I write them into a prompt?

- id: art_01M5NP65JNQEE7J45Z425FKN10
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T02, T05, T06 · tags: none
- updated: 2026-10-24T00:50:18.320Z
- url: https://veyrul.com/articles/art_01M5NP65JNQEE7J45Z425FKN10

Problem. 'Cinematic lighting' is vague; light has separable attributes. Conditions. Image or video prompts where lighting must be controlled or kept consistent between shots. Course-text statements (LibreTexts). Four properties: source, quality, direction and colour. Quality: hard light is intense and focused with harsh shadows; soft light is diffused with gradual transitions. Direction: practical lights in the set can motivate direction, e.g. a single overhead lamp in an interrogation room motivates hard light from above. Motivated light: a dim table lamp can be the visual reason for light on a face that is really lit by bright lights off camera - a psychological trick. Three-point: key is usually the brightest and exposes the main subject; fill softens; back separates. Colour: tungsten reads warm; the text suggests dialing about 2000K for a candle-lit look. Method (inference). Write lighting as four short clauses: source ('a table lamp camera-left'), quality ('soft, diffused'), di...

Problem. 'Cinematic lighting' is vague; light has separable attributes. Conditions. Image or video prompts where lighting must be controlled or kept consistent between shots. Course-text statements (LibreTexts). Four properties: source, quality, direction and colour. Quality: hard light is intense and focused with harsh shadows; soft light is diffused with gradual transitions. Direction: practical lights in the set can motivate direction, e.g. a single overhead lamp in an interrogation room motivates hard light from above. Motivated light: a dim table lamp can be the visual reason for light on a face that is really lit by bright lights off camera - a psychological trick. Three-point: key is usually the brightest and exposes the main subject; fill softens; back separates. Colour: tungsten reads warm; the text suggests dialing about 2000K for a candle-lit look. Method (inference). Write lighting as four short clauses: source ('a table lamp camera-left'), quality ('soft, diffused'), direction ('from camera left, slightly above'), colour ('warm 2700K tungsten'); name the motivation that is visible in frame; reuse the identical lighting clause in every shot of a scene to keep continuity; add contrast with a ratio statement only if needed (lighting-ratio definitions are covered in C3-B026-G7-02). The Hailuo master-reference page suggests Rembrandt or a three-point setup in the reference image for consistent catchlights (vendor claim). Failure modes. Prompting a visible practical without placing its light direction leads to inconsistent shadows (inference). Limitations. No evidence here on model obedience. Version/date. LibreTexts page CC BY-ND 4.0; fetched 2026-10-23.

Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.

Limitations: Prompt structure is inference. Hailuo statement is a vendor claim.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://human.libretexts.org/Courses/Nashville_State_Community_College/Tokyo_in_Film/02%3A_Pre-Production/2.04%3A_Cinematography/2.4.03%3A_Light_and_Lighting",
      "note": "Summary; Quality; Direction; Source; Three-point; Color; MRI Best Practices; prompt clauses"
    },
    {
      "url": "https://hailuoai.video/pages/knowledge/predictable-eye-line-framing-multi-angle-character-scenes",
      "note": "Summary; Quality; Direction; Source; Three-point; Color; MRI Best Practices; prompt clauses"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Problem. 'Cinematic lighting' is vague; light has separable attributes. Conditions. Image or video prompts where lighting must be controlled or kept consistent between shots. Course-text statements (LibreTexts). Four properties: source, quality, direction and colour. Quality: hard light is intense and focused with harsh shadows; soft light is diffused with gradual transitions. Direction: practical lights in the set can motivate direction, e.g. a single overhead lamp in an interrogation room motivates hard light from above. Motivated light: a dim table lamp can be the visual reason for light on a face that is really lit by bright lights off camera - a psychological trick. Three-point: key is usually the brightest and exposes the main subject; fill softens; back separates. Colour: tungsten reads warm; the text suggests dialing about 2000K for a candle-lit look. Method (inference). Write lighting as four short clauses: source ('a table lamp camera-left'), quality ('soft, diffused'), direction ('from camera left, slightly above'), colour ('warm 2700K tungsten'); name the motivation that is visible in frame; reuse the identical lighting clause in every shot of a scene to keep continuity; add contrast with a ratio statement only if needed (lighting-ratio definitions are covered in C3-B026-G7-02). The Hailuo master-reference page suggests Rembrandt or a three-point setup in the reference image for consistent catchlights (vendor claim). Failure modes. Prompting a visible practical without placing its light direction leads to inconsistent shadows (inference). Limitations. No evidence here on model obedience. Version/date. LibreTexts page CC BY-ND 4.0; fetched 2026-10-23. · locator: Summary; Quality; Direction; Source; Three-point; Color; MRI Best Practices; prompt clauses · source: https://human.libretexts.org/Courses/Nashville_State_Community_College/Tokyo_in_Film/02%3A_Pre-Production/2.04%3A_Cinematography/2.4.03%3A_Light_and_Lighting

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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