11. Lighting

Question 1

What are the 3 main types of lamps

Answer 1

Incandescent Lamps

Discharge lamps

LED lamps

Question 2

Tungsten Filament lamps

• Type
• Properties
• Light colour

Answer 2

Tungsten Filament lamps (GLS)
- Incandescent lamps
- Have poor efficacy
- Clear white light

Question 3

Tungsten Halogen Lamps

• Type
• Properties
• Light colour

Answer 3

• Incandescent
• Longer life as the halogen stops the evaporated tungsten from darkening the bulb.
• Clear white light

Question 4

Low Pressure Mercury

• Type
• Properties
• Light colour

Answer 4

• Discharge
• Known as fluorescent lighting.
• Produces a yellowish light

Question 5

High Pressure Mercury

• Type
• Properties
• Light colour

Answer 5

• Discharge
• Good colour. correction, meaning its good for CCTV applications
• Produce a near white light with a blue tinge.

Question 6

Metal Halide

• Type
• Properties
• Light colour

Answer 6

• Discharge
• Takes a while to reach good full brightness.
• Will not restart until the pressure in the lamp has fallen.
• Best colour rendering and efficacy.
• Produces a bright white light.

Question 7

LED

• Type
• Properties
• Light colour

Answer 7

• LED
• A P-N junction diode which emits light when energized.
• Can emit many colours. Emit white by combining RGB.
• Can be used around heat or UV sensitive material as they run cool and dont emit UV.
• 6x as efficient as incandescent and last 20,000 plus hours.

Question 8

Applications of LEDs.

Answer 8

• Indication lights on devices.
• Decorative lighting.
• Signs.
• Small and large lamps

Question 9

Metal halide lamp applications

Answer 9

• Stadiums
• Photography
• Sports arenas
• Security lighting

Question 10

High pressure mercury lamp applications

Answer 10

• Factory lighting
• Car park lighting
• Street lighting

Question 11

Low pressure mercury lamp applications

Answer 11

• General offices
• Domestic premises
• Shops
• Garages/workshops