Lighting

Question 1

What are the 3 main types of lighting?

Answer 1

1- incandescent
2- discharge
3- LED

Question 2

What type of lighting is tungsten filament lamps?

Answer 2

Incandescent

Question 3

What type of light is produced by tungsten filament lamps?

Answer 3

Clear white light

Question 4

What trait does tungsten filament lamp?(hint. Disadvantage)

Answer 4

Poor efficacy

Question 5

What type of lighting is tungsten halogen lamps?

Answer 5

Incandescent

Question 6

Why is halogen added to the tungsten halogen lamps?

Answer 6

To strop the tungsten evaporating

Question 7

What impact does the use of quartz glass have on tungsten halogen lamps?

Answer 7

The glass is weakened by human touch allowing the halogen gas to escape reducing the life expectancy of the lamp

Question 8

Incandescent lamps describe which two lamp types

Answer 8

Tungsten filament lamp
Tungsten halogen lamp

Question 9

How does discharge lighting work?

Answer 9

Work by discharging voltage across a gas filled tube, thus ionising the gas which reducing the resistance. This allows for lower voltage to maintain the ionisation

This type of lighting uses control gear like chokes to maintain low lamp currnts

Question 10

What are the 3 types of discharge lighting?

Answer 10

1- low pressure mercury lamps
2- high pressure mercury
3- metal halide lamps

Question 11

What type of light is produced by low pressure mercury lamps?

Answer 11

Ultraviolet light which is absorbed by the phosphor coating creating the light

Question 12

What applications can low pressure mercury lamps be used in?

Answer 12

Domestic
Offices
Shops
Workshops

Question 13

What colour of lighting is produced by high pressure mercury?

Answer 13

White light with a blue tinge

Question 14

What are the common applications used for high pressure mercury lamps?

Answer 14

Factory lighting
Car park lighting
Street lighting
CCTV
Any application that requires good colour correction

Question 15

High pressure mercury is used for cctv! Why?

Answer 15

Good colour correction

Question 16

What is the main difference between metal halide and high pressure mercury lighting?

Answer 16

Metal halide lamps use halides instead of mercury

Question 17

Why are metal halide lamps used for security and sports arena lighting?

Answer 17

Good colour rendering and efficacy

Question 18

What applications are metal halides used for?

Answer 18

Sports arenas
Security
General amenity

Question 19

How do LED lights work?

Answer 19

P-N junction diodes emits light when energised

Question 20

What type of light is produced by LEDS?

Answer 20

White light produced by combining red green and blue lights

Question 21

What are the advantages of LED lighting?

Answer 21

6x greater efficacy
20000 hours of life
Do not emit UV or IR so can be used around heat or UV sensitive materials

Question 22

What are the common applications of LED lighting?

Answer 22

Indication
Decoration
Small and large lamps
Signage
In areas sensitive to heat or UV

Question 23

What is the equation for lighting design?

Answer 23

F= E X A / CU X MF

Question 24

What does F stand for in the lighting design equation?

Answer 24

Luminous flux (lm)

Question 25

What does the E STAND FOR IN THE LIGHTING DESIGN EQUATION?

Answer 25

Illuminance level required (Lux)

Question 26

What does the A stand for in the lighting design equation?

Answer 26

Area

Question 27

What does CU stand for in the lighting equation?

Answer 27

Coefficient of utilisation

Question 28

What does MF stand for in the lighting design equation?

Answer 28

Maintenance factor