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Lighting > Science - Vision & Colour > Flashcards

Science - Vision & Colour Flashcards

0
Q

Visible light

Definition

A

Wavelengths ranging from 380nm to 780nm.

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1
Q

Light

definition

A

Visually perceived radiant energy, part of the electromagnetic spectrum.

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2
Q

Visible light is between what two parts of the electromagnetic spectrum .

A

Ultraviolet and infrared.

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3
Q

What colours corresponds to 380nm?

A

Blues

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4
Q

What colours correspond to around 500nm?

A

Greens

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5
Q

What colours correspond to around 600nm?

A

Oranges

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6
Q

Lumen

definition

A

Unit of measurement describing the quantity of light emitted from a source of light.

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7
Q

Watt

definition

A

Unit of power denoting the rate at which electricity is used.

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8
Q

Lumens per Watt (Efficany)

Definition

A

Measurement of how effective the light source is in turning the watts we put in into the light we want out.

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9
Q

Average Rated Life

Definition

A

Statistical way of determining how long lamps last before burning out.

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10
Q

What are the two classes of light receptors that the retina contains?

A

Rods and Cones.

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11
Q

How many cones does the human eye have?

A

About 8 million.

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12
Q

What are the cones in the human eye responsible for?

A

High-level daytime photo pic vision. Active in high light levels, responsible for colour vision.

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13
Q

How many types of cones does the human eye have.

A

Three

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14
Q

What is it called when one type of cone is missing or deficient?

A

Colour blindness

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15
Q

Rods:

  • When do they operate?
  • what type of vision are they responsible for?
A

Operate under very low light levels. Responsible for low-level night time vision (scotopic vision).

16
Q

How many types of rods are there?

A

One

17
Q

What do rods provide information on?

A

Only on the amount of light. Cannot provide info on colour.

18
Q

Mesopic Range

Definition

A

Neither photopic nor scotopic. How we see under many typic outdoor nighttime conditions.

19
Q

Light travels at what speed?

A

300,000km per second

aka: 186,000 miles per second

20
Q

Does light behave as a wave or a particle?

A

Light can behave as both a wave or a particle.

21
Q

Unit of measurement for light wavelengths.

A

Nanometers

22
Q

Colours in daylight?

A

Mixture of all of the colours.

23
Q

For white electric lighting, what mixture of colours are needed to produce white?

A

Red, Green, Blue

24
Q

Spectral Power Distribution (SPD) Curve

Definition

A

Shows the precise colour output of a light source by charting energy levels at each wavelength.

25
Q

Colour-Rendering Index (CRI)

definition

A

A number between 1 and 100 that describes the ability of a lamp to accurately render all the colour in a lighted space.

26
Q

A good CRI might be anything over what number?

A

CRI 80+

27
Q

Colour Temperature

definition

A

The absolute temperature of a blackbody radiator, having chromaticity equal to that of the source.

28
Q

Correlated Colour Temperature (CCT)

Definition

A

Overall colour appearance of a lamp, measured in Kelvins (k).

29
Q

Example of colour temperature of a warmer light source…

A

2700-3000K

30
Q

Example of the colour temperature of a cooler light source, such as one that might be used in an office…

A

3500-4100K

31
Q

Incandescent Lamp

definition

A

A lamp that produces light when it’s filament is heated by an electric current, causing it to glow/incandescent.

Lighting (8 decks)

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