Light (Leaving Cert Construction Studies): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does the unit 'watt' measure in lighting?
What does the unit 'watt' measure in lighting?
Power consumption
What does the unit 'lumen' measure?
What does the unit 'lumen' measure?
Total visible light emitted by a source
What does the unit 'lux' quantify?
What does the unit 'lux' quantify?
Light reaching & illuminating a surface
How is lux calculated from lumens?
How is lux calculated from lumens?
What is the primary function of a lux meter?
What is the primary function of a lux meter?
Measures illumination levels at locations
At what height should lux readings be taken?
At what height should lux readings be taken?
Working plane height (0.8-1.0m)
What is the standard lux value for an overcast sky?
What is the standard lux value for an overcast sky?
5000 lux
What is the typical window factor (WF) value?
What is the typical window factor (WF) value?
0.5
What is the typical efficiency coefficient (E) value?
What is the typical efficiency coefficient (E) value?
0.4
How many lumens can a 40W tungsten & 7W fluorescent both produce?
How many lumens can a 40W tungsten & 7W fluorescent both produce?
400-500 lumens