Surface Illumination

What is the definition of illuminance?

• The measure of the amount of sound that illuminates a surface area.

• The measure of the amount of heat that illuminates a surface area.

• The measure of the amount of water that illuminates a surface area.

• The measure of the amount of light that illuminates a surface area.

Illuminance is a measure of the amount of what per unit area?

• pressure

• light

• temperature

• sound

In the International System of Units (SI), illuminance is measured in what unit?

• gram

• second

• meter

• lux

What is the formula for illuminance?

• E = Φ / A

• E = Φ * A

• E = Φ + A

• E = Φ - A

What is the symbol used to represent illuminance?

• U

• E

• L

• I

Illuminance is also known as what?

• Luminous flux per unit area

• Luminous intensity per unit area

• Brightness per unit volume

• Light density per unit distance

What is the importance of illuminance in lighting design?

• It is only important for outdoor lighting

• It has no impact on the visibility of a space

• It only affects the color temperature of the lighting

• It determines the level of light that reaches a surface, affecting visibility and the overall atmosphere of a space.

How does illuminance differ from luminance?

• Illuminance measures the amount of light that is emitted or reflected from a surface, while luminance measures the amount of light that falls on a surface.

• Illuminance measures the amount of light that falls on a surface, while luminance measures the amount of light that is emitted or reflected from a surface.

• Illuminance measures the amount of heat that falls on a surface, while luminance measures the amount of light that is emitted or reflected from a surface.

• Illuminance measures the amount of sound that falls on a surface, while luminance measures the amount of light that is emitted or reflected from a surface.

What are the factors that affect illuminance?

• Number of people in the room, time of day, and humidity level

• Size of the light fixture, material of the floor, and type of furniture in the room

• Distance from the light source, angle of the light, and presence of obstructions or reflective surfaces

• Color of the light, temperature of the room, and type of light bulb used

Why is illuminance important in photography and cinematography?

• It determines the amount of light that reaches the camera sensor or film.

• It has no impact on the quality of the photograph or video

• It is only important for outdoor photography

• Illuminance only affects the color balance of the image

Tags

NGSS.HS-PS4-5