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Lighting in Buildings: Understanding Lumen, Lux, and Watt

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Lighting in Buildings: Understanding Lumen, Lux, and Watt

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Questions and Answers

What does the candela measure?

Light falling on a surface

Light intensity perceived by the human eye

Luminous flux

Intensity (correct)

How is illuminance measured?

In lux (correct)

In lumens

In candela

In watts

What does one lux correspond to?

One joule per square meter

One watt per square meter

One candela per square meter

One lumen per square meter (correct)

Which of the following locations typically has an illuminance of 500 lux?

Family living room Signup and view all the answers

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 Signup and view all the answers

If a light source delivers 2000 lm and the distance from the source is doubled, what happens to the lux at that distance?

Halved Signup and view all the answers

Which light fixture would be most suitable for high bay factory or warehouse lighting installations?

400W Metal Halide lamp Signup and view all the answers

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. Signup and view all the answers

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 Signup and view all the answers

Which light fixture would be most suitable for street or outdoor area lighting?

150W High pressure sodium bulb Signup and view all the answers

According to the information provided, which light fixture would be most suitable for general domestic and task lighting applications?

100W Incandescent bulb Signup and view all the answers

Which light fixture would be most suitable for office ceiling panel installations?

32W T5 or T8 Fluorescent tube Signup and view all the answers

What is the formula used to calculate the area illuminated by a beam?

$A = \pi r^2$ Signup and view all the answers

If the beam angle is 30, what is the value of the tangent of half the beam angle?

$\tan(15) \approx 0.2679$ Signup and view all the answers

What is the area illuminated by the beam at a distance of 4 meters?

3.60 m^2 Signup and view all the answers

What is the lux value of the light source with 1500 lumens and an illuminated area of 3.60 m^2?

416.7 lx Signup and view all the answers

If the required lux level is 500 lx, what is the BEST way to achieve this?

Decrease the distance to the light source Signup and view all the answers