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Flashcards in Light Concept Deck (85)
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1

Range of all types of electromagnetic radiation

Electromagnetic spectrum

2

Energy in the form of waves, including gamma rays, x rays, UV, visible light, IR, microwave, and radio waves

Classified by wavelengths using nanometers

Electromagnetic radiation

3

Distance between two points on a wave in which the wave repeats itself

Wavelengths

4

Wavelengths range from

400 nanometer to 700 nm

5

Can cause skin and eye damage

UV light

6

Can cause air or objects to heat up, raise building temp

Infrared

7

Great source of illumination with positive effect on health
• too much can cause glare and affect visual acuity

Natural light

8

Converts electrical energy into light

Lamp

9

Complete lighting unit that includes the components that distribute light, position, and protect the lamps ,and provide connection to power supply

Luminaire

10

4 types of lamps

Incandescent
Fluorescent
High intensity discharge (HID) lamps
LED light emitting diode

11

lamp that produces light by flow of current through tungsten

Low cost, but low electrical efficiency and shorter life than other lamps

Incandescent

12

Low pressure discharge lamp where mercury vapor transforms UV light to visible light

Contains mixture of inert gas (argon and mercury vapor), provides UV light

Fluorescent Light

13

Produces light from an arc tube

High Intensity Discharge Lamps

14

Light producing element of an HID light

Arc tube

15

Contains metallic and gaseous vapors and electrodes

Includes in a bulb, may include phosphor that improves color rendering, increases light output, and reduces surface brightness

Types include low pressure sodium, mercury vapor, metal halide and high pressure sodium lamps

Arc tube

16

Lamp with semi conductor devices that produce visible light when current passes through them

LED Lamp

17

Benefits of LED Lamp

-Uses less energy and generate less heat
-Some contains combination of red green and blue
-This combination allows a fixture to be tunable, the color of light can be changed via external control

18

3 types of lighintg

Ambient lighting
Task lighting
Accent lighting

19

Known as general lighting, main source of nonspecific illumination of the space

Bright enough to allow safe movement

Should be integrated with daylight control system to maintain proper light levels in spaces

Ambient lighiting

20

Used to illuminate an area in order to allow the performance of a specific function

Often controlled by building occupants
- Level of control may be mandated by building codes
- Can reduce the glare on reflective surfaces, reducing eye strain and increasing productivity

Task Lighting

21

Decorative lighting, used to highlight architectural or design features of space

Generally small percentage of the lighting load but may be used to influence a positive effect on visual acuity and occupant health

Accent lighting

22

color of light produced by light source

color temperature

23

spectral distribution of EM radiation measured in Kelvin

correlated color temperature CCT

24

Lower the Kelvin, the xx the light?

warmer

25

Higher the Kelvin, the xx the light?

cooler

26

Warm light - shade?
Cool light - shade?

Warmer light has yellow shade
Cooler light has blue shade

27

Caused by fluctuation of voltage

Occurs more frequently with fluorescent lights with older ballasts

Flicker

28

Total luminous output of a light source

Luminous Flux

29

Measured in lumens and weighted to the visual sensitivity of the human eye

Total perceived amount of light being given off in all directions

Luminous Flux

30

Radiant power weighted to human vision that describes light emitted by source

Measured by candela

Luminous intensity