Daylighting Analysis and Design

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Questions and Answers

What effect does having a better view out of an office window have on performance?

Has no measurable effect

Increases productivity by 7%–12% (correct)

Makes employees feel more tired

Reduces productivity by 5%

What is defined as the difference between the brightness of an object and its immediate background?

Brightness

Contrast (correct)

Clarity

Shade

Patients in well daylit rooms require 30% more pain-relief medication.

False

What percentage of pain-relief medication do patients in well daylit rooms need compared to those in poorly daylit rooms?

30% less Signup and view all the answers

Excessive contrast can lead to a phenomenon called glare.

True Signup and view all the answers

In offices, better views are associated with higher overall __________.

performance Signup and view all the answers

What is the term used to describe excessive brightness difference that may cause discomfort?

glare Signup and view all the answers

The difference in brightness between an object and its _____ is known as contrast.

background Signup and view all the answers

Match the following settings with their key benefits:

Offices = Increased productivity Hospitals = Faster recovery and reduced pain relief needed Signup and view all the answers

Match the following terms with their definitions:

Contrast = Difference in brightness between an object and its background Glare = Excessive contrast leading to discomfort Brightness = Intensity of light emitted or reflected from an object Background = Area surrounding the main subject Signup and view all the answers

Which of the following methods can help in reducing glare?

Sensitive interior design Signup and view all the answers

Increasing brightness contrasts is a technique to avoid glare.

False Signup and view all the answers

What are the two basic methods to avoid glare?

Sensitive interior design and daylight light controls Signup and view all the answers

The two methods to reduce glare are sensitive interior design and __________.

daylight light controls Signup and view all the answers

Match the following terms with their definitions:

Glare = Excessive brightness causing discomfort Daylight light controls = Techniques to manage incoming natural light Sensitive interior design = Interior design that takes light conditions into account Brightness contrasts = Difference in light levels in a space Signup and view all the answers

Which unit measures the amount of light flowing through a space?

Lumens Signup and view all the answers

Candelas are used to measure luminous flux.

False Signup and view all the answers

What is the term used for the amount of light that falls on a surface per unit area?

Lux Signup and view all the answers

The amount of light emitted by a light source is referred to as __________.

luminous flux Signup and view all the answers

Match the following light-related terms with their definitions:

Candelas = Measure of luminous intensity Lumens = Measure of luminous flux Lux = Measure of illumination Luminous Flux = Amount of light through a space Signup and view all the answers

What is the unit used to measure illuminance?

Lux Signup and view all the answers

The unit for measuring luminance is lumens per unit area.

False Signup and view all the answers

What does the term 'luminance' refer to?

Light reflected from a surface Signup and view all the answers

Illuminance can be measured in _ or _.

lux, footcandles Signup and view all the answers

Match the following terms with their definitions:

Lux = Lumens per square meter Footcandles = Lumens per square foot Luminance = Light reflected from a surface Candelas/m2 = Unit for measuring luminance Signup and view all the answers

Study Notes

Daylighting Analysis and Design

Daylighting in offices improves performance, increasing productivity by 7-12%.
Daylighting in hospitals reduces the need for pain relief by 30%, making recovery faster and improving patient spirits.

Glare and Contrast

Glare is caused by excessive contrast between an object and its background.
Two methods for avoiding glare: sensitive interior design and daylight light controls.

Theory and Perception of Light

Luminous flux is the amount of light flowing through a space, measured in lumens per unit area.
Lux is the unit of measurement for luminous flux, equal to lumens per square meter.
Footcandles are another unit of measurement for luminous flux, equal to lumens per square foot.
Luminance is the light reflected from a surface, measured in candelas per square meter.

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Description

This quiz explores the impact of daylighting on performance in offices and recovery in hospitals. It also delves into the concepts of glare, contrast, and the measurement of light, including luminous flux and luminance. Test your knowledge on how effective lighting design can enhance well-being and productivity.