WorksheetsC&G lighting units and inverse square
Total questions: 8
Worksheet time: 4mins
What is the flow of light emitted from a light source measured in?
Lumens
Lux
Candela
Luminous Intensity
What is the measure of light falling on a surface?
Lux
Lumens
Luminous Intensity
Candela
What is the illuminating power of light in a given direction measured in?
Candela
Lux
Luminous Intensity
Lumens
Where are lux levels measured?
At the light source
On the ceiling
At the working plane
On the walls
What is the recommended illuminance level for a school art room?
150 Lux
500 Lux
1000 Lux
300 Lux
What is the mean level of illuminance throughout the life of the lighting system averaged over the area illuminated called?
Illuminance
Luminous Intensity
Luminous Flux
Mean Illuminance
What law describes the dissipation of light over a larger area as the distance from the point source of light increases?
Inverse Cube Law
Cube Law
Square Law
Inverse Square Law
A light fitting has a Luminous Intensity of 3200cd and is 3.8 metres above a surface. Calculate the Illuminance (lux) at the surface (2 significant figures)
220 Lux
880 Lux
660 Lux
440 Lux
