17 Questions
What does the candela measure?
Intensity
How is illuminance measured?
In lux
What does one lux correspond to?
One lumen per square meter
Which of the following locations typically has an illuminance of 500 lux?
Family living room
In the context provided, what action should be taken if the required Lux was 500 Lux but the measured Lux is lower?
Increase the luminaire's brightness
If a light source delivers 2000 lm and the distance from the source is doubled, what happens to the lux at that distance?
Halved
Which light fixture would be most suitable for high bay factory or warehouse lighting installations?
400W Metal Halide lamp
What is the primary benefit of modifying the beam angle of a light fixture?
It concentrates the light more effectively on a specific area, increasing the lux.
Which of the following light fixtures would be the most energy-efficient replacement for a 400W metal halide or sodium high bay light?
200W LED array in a high bay fitting
Which light fixture would be most suitable for street or outdoor area lighting?
150W High pressure sodium bulb
According to the information provided, which light fixture would be most suitable for general domestic and task lighting applications?
100W Incandescent bulb
Which light fixture would be most suitable for office ceiling panel installations?
32W T5 or T8 Fluorescent tube
What is the formula used to calculate the area illuminated by a beam?
$A = \pi r^2$
If the beam angle is 30, what is the value of the tangent of half the beam angle?
$\tan(15) \approx 0.2679$
What is the area illuminated by the beam at a distance of 4 meters?
3.60 m^2
What is the lux value of the light source with 1500 lumens and an illuminated area of 3.60 m^2?
416.7 lx
If the required lux level is 500 lx, what is the BEST way to achieve this?
Decrease the distance to the light source
Learn about the importance of lumen and lux in lighting design for buildings. Explore how these units measure luminous flux and light intensity, and how they impact the brightness of a luminaire. Delve into the concept of lux as the amount of light falling on a surface.
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