Questions
What is the actual difference between light of different colours?
The frequency of the EM wave determines the amount of amount energy it contains. Therefore, different colors of light have different frequencies and amount of energy.
How slow can we make light go?
When light passes through different media its speed slows. The slowest speed recorded is through sodium at -272 C during which the speed of light fell to 60kph – about the speed of a bicycle.
3. What does light symbolise in the following painting of the Greek god Prometheus wielding the flame of a torch?
It symbolizes the fact that The Prometheus came to people to give people light. Another reason is probably that he came to help people and here the light could be defined as help.
4. Fill in definitions for the following lighting concepts:
Ambient light
The soft indirect light that fills the volume of a room with illumination.
Direct light
Illumination on a subject or area that goes directly from the front of the luminaire in a straight line to the subject
Warm white
“Warm white” is the same colour temperature as the standard inefficient incandescent, imparts a more orange/red light on objects, is normally associated with red or orange objects.
Diffuser
A light fixture, such as a frosted globe, that spreads light evenly.
Watts
An International System unit of power equal to one joule per second.
Luminosity
the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
Efficiency
The ratio of the energy delivered (or work done) by a machine to the energy needed (or work required) in operating the machine.
5. Fill in the table below describing the different kinds of lighting available:
Picture Name Feature Use
Ambient light Light source is covered by diffuser This type of light source is mainly used to provide the scene with a basic view of the different objects in it. Eg. Desk lamp
Spot light Bright, direct light, narrow beam, no diffusion. searchlights or spotlights are used in advertising, fairs, festivals and other public events. Eg. Lights in the art center
Pendant light Light can be diffused or directed down; hangs from ceiling; usually a design feature. Pendant lights are often used in multiples, hung in a straight line over kitchen countertops and dinette sets or sometimes in bathrooms. Eg. Lights in the bathroom
Task light Light points downward; often articulated; no direct light to eyes. Often task lighting refers to office lighting, where the task light is used to increase illuminance on the reading area. Eg. Desk light
LEDs come in several shapes. List three kinds of lighting they can replace.
a. Standard
b. Globe
c. Candle
What is the actual difference between light of different colours?
The frequency of the EM wave determines the amount of amount energy it contains. Therefore, different colors of light have different frequencies and amount of energy.
How slow can we make light go?
When light passes through different media its speed slows. The slowest speed recorded is through sodium at -272 C during which the speed of light fell to 60kph – about the speed of a bicycle.
3. What does light symbolise in the following painting of the Greek god Prometheus wielding the flame of a torch?
It symbolizes the fact that The Prometheus came to people to give people light. Another reason is probably that he came to help people and here the light could be defined as help.
4. Fill in definitions for the following lighting concepts:
Ambient light
The soft indirect light that fills the volume of a room with illumination.
Direct light
Illumination on a subject or area that goes directly from the front of the luminaire in a straight line to the subject
Warm white
“Warm white” is the same colour temperature as the standard inefficient incandescent, imparts a more orange/red light on objects, is normally associated with red or orange objects.
Diffuser
A light fixture, such as a frosted globe, that spreads light evenly.
Watts
An International System unit of power equal to one joule per second.
Luminosity
the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
Efficiency
The ratio of the energy delivered (or work done) by a machine to the energy needed (or work required) in operating the machine.
5. Fill in the table below describing the different kinds of lighting available:
Picture Name Feature Use
Ambient light Light source is covered by diffuser This type of light source is mainly used to provide the scene with a basic view of the different objects in it. Eg. Desk lamp
Spot light Bright, direct light, narrow beam, no diffusion. searchlights or spotlights are used in advertising, fairs, festivals and other public events. Eg. Lights in the art center
Pendant light Light can be diffused or directed down; hangs from ceiling; usually a design feature. Pendant lights are often used in multiples, hung in a straight line over kitchen countertops and dinette sets or sometimes in bathrooms. Eg. Lights in the bathroom
Task light Light points downward; often articulated; no direct light to eyes. Often task lighting refers to office lighting, where the task light is used to increase illuminance on the reading area. Eg. Desk light
LEDs come in several shapes. List three kinds of lighting they can replace.
a. Standard
b. Globe
c. Candle
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ReplyDeletePendant Lights
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ReplyDeletePendant Lights