Modifiers matching illumination:

• light,
• artificial,
• bright,
• unwanted,
• incident,
• architectural,
• normal,
• external,
• ambient,
• outdoor,
• special,
• strong,
• general,
• controlled,
• ordinary,
• weak,

Simple categories matching incident:

• organisation,
• crime,
• document,
• particle,
• light,
• hadron,
• illumination,
• radiation,
• energy,
• situation,
• ion,
• information,