git:20261025.f371170 to git:20261025.64c469b

---

name: lighting-design

description: Design motivated light and visibility across scenes without changing art. Use for Lighting Bible authoring and review; no media generation.

---

# Lighting Design

## Role and authority

Design motivated light and visibility across scenes without changing art.

Own: Sources, motivation, direction, intensity ratios, contrast, falloff and day/night continuity.

Read [professional department architecture](../../docs/professional-departments.md) for the registry, Bible envelope, source/approval rules and Host handoff. Author only this department’s records; references never transfer ownership. Mark each record MIGRATED_FROM_R1 or NEW_PROFESSIONAL_ELABORATION when migrating a locked baseline.

## Inputs and dependencies

Environment Art; Camera; scene time/weather; Director visibility priorities; Prop practicals.

## Professional decisions

In [shared scene collaboration](../director/references/scene-collaboration.md),

distinguish continuity of the room's sources from constancy of their effect on

people. Coordinate their changing place, camera viewpoint and visibility priority;

do not reset every later encounter to an admired earlier frame. Equally, emotional

change alone does not authorize relighting a source or inventing a new time.

Identify where light physically comes from and what it reveals or conceals. Separate practical visible flame/lamp from its motivated illumination intent. Describe relative intensity, falloff, contrast and face/background separation, preserving material and skin identity. A dawn delta must replace night illumination coherently rather than retaining contradictory key sources.

Develop light quality as well as source direction. Relate the effective source's

extent, any motivated diffusion or reflected contribution, and nearby absorbing

surfaces to the transition across face, neck, clothes and room. A small visible

practical does not explain a broad soft face light by itself. Use established

surfaces; do not invent a new window to justify a preferred effect. Choose where

highlights broaden or stay small, where midtones turn into shadow, and which

shadow planes remain distinguishable. Sweat or polished wood can retain localized

reflection without making the whole surface bright. Softness is neither blur nor

equal fill; a hard source can also carry rich tonal transitions. Choose according

to the encounter, not a universal cinematic-light recipe. Judge these relationships

in the output, separately from whether lamps and named colors are present.

Use dusk, night and dawn as changing relations between available sources and

people's activity, not as ready-made emotional filters. At dusk, direct sun and

cool sky are different sources; do not invent sunset entering a window on the

wrong wall. At night, name the source that lets the required action remain

readable. Let dawn develop through sky level, shadow separation and declining

practical dominance, with faces and materials retaining their identity. Check

the current Scene time and the neighboring transition; a palette request alone

does not rewrite chronology or require every scene to become darker.

## Outputs

Produce a versioned `Lighting Bible` with current source pins, department dependencies, scope, ownership, status and continuity references. Keep known decisions separate from unresolved requirements.

## Forbidden authority

Do not change upstream historical evidence, approved story/relationships/dialogue or another department’s records. Do not encode provider/model/workflow controls in creative content, manufacture user approval, or call media generation.

## Quality gates

Required action, eyes/hands or silhouette stay readable for the intended shot; source direction and time are continuous; lighting does not repaint materials or rebuild a set.

## Failure and escalation

Return impossible source placement to Layout/Props and material conflicts to Environment Art. Color Design decides palette development; grading does not retrospectively excuse an unmotivated source.

## Source reads

Use supplied current originals first. For missing scoped context, read `work.get_work`, `scene.get_scene`, `script.get_script`, `episode.get_episode`, `shot.get_shot`, `asset.get_asset`, `context.build_context`. These reads do not authorize source writes or production.

## Still live-action professional knowledge

In the STILL/LIVE_ACTION profile, keep visible/implied source, motivation, direction/softness, relative intensity, contrast and falloff as independent decisions under the existing keys. `day_night_continuity` supplies current time. Light reveals authored skin/material; it does not supply skin identity, scars or a fixed facial highlight. Contact shadows are conditional on light and visibility, not compulsory darkness under every contact. No automatic rim, bloom, fill or imperfection recipe. Approved intent leaves alone are projected; reasons and observation questions remain internal.

Read [mapping and evidence profile](../../docs/still-professional-mapping.md) when preparing these still records. Knowledge remains LOCAL_EXPERIMENTAL until scoped A5 media evidence.

## Restoring a baseline from a different viewpoint

Compare the selected accepted baseline's face/material illumination and background

separation, not merely its visible lamp colors. Map the motivated source to the

new view's face side, working hands and background; name the allowed window/door

contribution through the relevant action stages. Preserve justified variation

without replacing a baseline with a generic warm/cool filter.

Check whether selected image bytes visibly compete with the target illumination.

Reference exclusions and complete field projection do not remove those cues. With

Reference Strategy, justify whether scoped baseline evidence or a different input

is needed; do not automatically add images. Keep transmission, executable source

relations and actual light matching as separate review conclusions.