Lux
Illuminance: lumens per square metre falling on a surface.
A projector's lumens divided by the image area gives the lux on the surface. Comparing that with ambient lux (streetlights, moonlight) predicts how visible the projection will be.
Related terms
- Lumens (ANSI / ISO)The total light output of a projector; ANSI and ISO 21118 are standard measurement methods…
- Ambient lightLight from other sources (streetlights, shop windows, the sky) that washes out the project…
- Contrast ratioThe ratio between the brightest white and the darkest black a projector or scene can show.
Put it into practice: throw-distance calculator · lumens calculator · intro to projection mapping