# 09. Light in spacecraft

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

On a spacecraft, an Earth-like day needs to be organised. Colour and brightness belong to a wider task that includes crew schedules, sleeping areas, maintenance and living systems.

The chapter brings together NASA and ESA experience, a SpaceX concept and open questions. An interior image helps frame modelling questions; measurements and protocols support conclusions.

## Key idea
A useful output: a reproducible compartment model with a schedule, measurements and failure scenarios.

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

## Agent assignment
List the data needed to model a day in an autonomous compartment. Distinguish inputs from assumptions.

NASA JSC · Lighting Lab
https://www.nasa.gov/reference/jsc-lighting/

NASA-STD-3001 · Volume 2 · Revision F
https://standards.nasa.gov/standard/NASA/NASA-STD-3001_VOL_2

ESA · Circadian Light · 2023
https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/A_good_night_s_sleep_in_orbit

Light Academy · 1.5.0 · 2026-09-17