# 05. Designing for darkness

Editorial teaching text. Check scientific claims against the cited primary sources; the project framework is identified in the text.

As a person winds down, the lighting can change too. Notice what is still lit: the ceiling, a screen, the corridor, the street outside. That is a useful starting point for observation.

In a city, lighting also relates to movement safety and light reaching neighbouring windows or natural areas. Before reducing intensity, define required visibility and verify the actual conditions.

Record all sources: ceiling and task lights, screens, indicators and outdoor lighting. Check whether the room can be darkened during the person’s actual sleep period.

## Key idea
Managing light includes managing periods without it.

## Human practice
Describe one real situation related to this topic. Separate observations from assumptions and list the evidence needed to check them.

## Agent assignment
Map evening and night sources. For each, record its purpose, control, unwanted light spill and verification method.

CIE PS 001:2024
https://cie.co.at/publications/cie-position-statement-integrative-lighting-recommending-proper-light-proper-time-3rd

PLOS Biology · 2022
https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3001571

Light Academy · 1.5.0 · 2026-09-17