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Topic 13 - High Intensity Discharge Lighting

One purpose of the ballast in a fluorescent light is to:

Suppress radio interference

Power factor correction

Prevent interference with switching operations

Limit the current through the discharge tube

Production of light in a discharge lamp occurs when the gas or vapour is:

Polarised

Ionised

Atomised

Phosphoresced

Number the following in order to efficacy from lowest to highest: G.L.S

Compact fluorescent

Mercury vapour

Metal halide

High pressure sodium

Low pressure sodium

LED

Identify the lamp category: Fluorescent

LID

HID

Incandescent

High pressure sodium

LID

HID

Incandescent

Metal halide

LID

HID

Incandescent

Halogen

LID

HID

Incandescent

The time for a mercury vapour lamp to reach full brightness is:

5 to 7 minutes

7 to 12 minutes

3 minutes

15 minutes

HID mercury vapour lamps produce visible light mainly in the:

Blue-white colour region

Blue-green colour region

Blue-red colour region

Blue-yellow colour region

The colour of light emitted by a high pressure sodium lamp is:

Golden-white

Daylight

Warm white

Cool white

The metal halide lamp includes metal halides inside the arc tube:

To give a longer lamp life

To reduce the overall size of the bulb

To reduce restrike time

To improve colour rendition

Approximately how much power is converted in to light by a LED?

90%

80%

50%

25%

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