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Lighting Up Trivia Quiz

Welcome to the world of lighting and lamps. They are something none of us can live without, yet very seldom give any consideration to.

A multiple-choice quiz by 51percent. Estimated time: 5 mins.

Author
51percent

Time
5 mins

Type
Multiple Choice

Quiz #
245,456

Updated
Dec 03 21

# Qns
10

Difficulty
Tough

Avg Score
5 / 10

Plays
1164

One at a Time - Single Page - Timed Game

Question 1 of 10

1. The levels of light on a surface is called illuminance. What is the unit for illuminance? Hint

Lux

Flux

Lumens

Candelas

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Question 2 of 10

2. What is the gas present in fluorescent lamps? Hint

Sodium Vapour

Neon

Mercury Vapour

Tungsten Vapour

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Question 3 of 10

3. Which of the following lamps does not need a ballast, transformer or control gear? Hint

Incandescent lamp

High Pressure Mercury Vapour lamp

Fluorescent Lamp

Sodium Vapour lamp

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Question 4 of 10

4. Luminous efficacy is the measurement of lumens per watt of a lamp. Which of the following lamps has the highest efficacy? Hint

Fluorescent

Incandescent

Metal Halide

High Pressure Sodium

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Question 5 of 10

5. Which of the following lamps would be most suitable in an installation at a sports ground, where there is TV coverage of the game? Hint

High Pressure Sodium

Metal Halide

Mercury Vapour

Incandescent

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Question 6 of 10

6. What is the advantage of using electronic control gear for fluorescent lamps over normal switched start ballasts? Hint

All the reasons listed

Lower electricity costs

No flicker

Longer lamp life

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Question 7 of 10

7. For external light fittings, the IP rating has to be considered. What does IP stand for? Hint

Illuminance Product

Ingress Protection

Internal Protocol

Inpenetrable

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Question 8 of 10

8. Which is the most suitable reflector or diffuser for use in an office where personnel work on computers? Hint

Opal glass diffuser

No diffuser is necessary

Double parabolic diffuser

Prismatic diffuser

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Question 9 of 10

9. Home lighting is generally a mixture of incandescent lamps, compact fluorescent lamps, tubular fluorescent lamps and halogen lamps. Which of the lamps typically requires a transformer? Hint

Compact Fluorescent

Tubular Fluorescent

Incandescent

Halogen

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Question 10 of 10

10. Which of the following factors is important when doing a lighting design? Hint

Aesthetics and choosing the correct fitting for the application

Lighting costs - initial, running and replacement

All are important

Lamp colour versus Efficacy

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Quiz Answer Key and Fun Facts

1. The levels of light on a surface is called illuminance. What is the unit for illuminance?

Answer: Lux

The rate at which light is emitted by a lamp is the luminous flux, which is measured in lumens. The amount of luminous flux radiating in a particular direction is measured in candelas, and the illuminance is the amount of luminous flux falling on a given surface.

2. What is the gas present in fluorescent lamps?

Answer: Mercury Vapour

The fluorescent lamp is a low-pressure mercury vapour lamp. Fluorescent lamps are generally used in office lighting. Neon lighting is generally the brightly coloured lighting used to accentuate buildings. (Think Las Vegas).

3. Which of the following lamps does not need a ballast, transformer or control gear?

Answer: Incandescent lamp

Fluorescent lamps, high pressure mercury vapour lamps and sodium vapour lamps are all known as discharge lamps. Discharge lamps have a negative current/voltage characteristic, which means that a current supplied at a constant voltage will increase in intensity until it destroys the lamp. A ballast limits the current.

4. Luminous efficacy is the measurement of lumens per watt of a lamp. Which of the following lamps has the highest efficacy?

Answer: High Pressure Sodium

A high pressure sodium (HPS) lamp has a typical efficacy of 90, while an incandescent lamp has an typical efficacy of only 15. However, although a HPS lamp gives out more light, the colour is not as good as the other lamps, which only makes it suitable for certain installations.

5. Which of the following lamps would be most suitable in an installation at a sports ground, where there is TV coverage of the game?

Answer: Metal Halide

Metal halide has a good trade off between efficacy and colour rendering. The best colour under lights would be obtained by the use of incandescent lamps, however, the installed wattage would be at least 5 times more. Metal halide also has a far better colour rendering than HPS or mercury lamps.

6. What is the advantage of using electronic control gear for fluorescent lamps over normal switched start ballasts?

Answer: All the reasons listed

The use of electronic control gear in fluorescent luminaires is becoming the accepted norm, due to the above reasons, and others, including higher lamp output, constant lamp performance, and better power factor. Electronic control gear and transformers are also used for other lamp types.

7. For external light fittings, the IP rating has to be considered. What does IP stand for?

Answer: Ingress Protection

The two digits of the IP rating provide the rating against foreign bodies, and against water respectively. A light fitting with an IP 65 rating will be dust-tight, and protected against jets of water.

8. Which is the most suitable reflector or diffuser for use in an office where personnel work on computers?

Answer: Double parabolic diffuser

The type of diffuser controls the reflected glare. A light fitting reflecting onto a computer monitor can be disturbing. A double parabolic diffuser limits the angle of the light from the fitting to less than 60 degrees, preventing glare.

9. Home lighting is generally a mixture of incandescent lamps, compact fluorescent lamps, tubular fluorescent lamps and halogen lamps. Which of the lamps typically requires a transformer?

Answer: Halogen

Although halogen lamps are available at mains voltage, these are more expensive than the 12 Volt lamps, and are more susceptible to voltage fluctuations. Incandescent lamps operate at mains voltage, and ballasts are required for tubular fluorescent lamps and compact fluorescent lamps. (Some compact fluorescent lamps have the ballast built into the base).

10. Which of the following factors is important when doing a lighting design?

Answer: All are important

Other factors to consider are glare limitation, the direction of the light, visual comfort, uniformity, quantity of light required, the IP rating of the fitting, and any special requirements for emergency lighting and hazardous area lighting. If you chose "Lighting Cost", then you are probably an accountant or a quantity surveyor.

Source: Author 51percent

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