The Ultimate Lighting Quiz

Staff

4 Min Quiz

Image: refer to hsw

About This Quiz

Lighting uses energy in various ways to enhance what we see around us. Take this quiz to determine see how enlightened you are about lighting.

What is the main reason why a regular incandescent bulb is not energy efficient?

Much of the electricity used in an incandescent bulb turns into heat instead of light. Since the main function of a light bulb is to provide light, all of the heat generated is considered a waste of energy.

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What happens to an incandescent bulb to cause it to burn out?

During the process of making light the tungsten filament is slowly vaporized onto the glass bulb until the filament is so thin that it breaks. When the filament breaks, the electric circuit is open and electricity no longer flows to illuminate the bulb.

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On average, how many hours of normal usage do you get from an incandescent bulb?

An incandescent bulb will average 750 to 1,000 hours of usage.

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Why is the envelope of the halogen bulb made from quartz?

Halogen bulbs are more compact, which places the filament very close to the envelope. A glass envelope would melt due to the increased exposure to heat.

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What is the effect on a heated tungsten filament when used in a bulb filled with halogen gas?

Inside a hot bulb, the vaporized tungsten combines with the halogen gas atoms and is deposited back onto the filament. This process insures that the halogen bulb lasts much longer than its incandescent cousin by regenerating the filament.

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Approximately how many lumens of light per watt does an incandescent bulb generate?

Incandescent bulbs give approximately 15 lumens of light per watt of input electricity. Incandescent bulbs get so hot that ovens made for children often use these light bulbs to cook the food.

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How many electrodes are contained in a fluorescent tube?

A fluorescent tube contains two electrodes. During the process of creating light electrons move between the two electrodes.

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What are the two gases contained in a fluorescent tube?

Fluorescent tubes contain the inert gas argon and a small amount of mercury, which changes from a liquid to a gas when an electric current passes through it.

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Fluorescent bulbs:

Fluorescent bulbs produce far less heat and far more light than incandescent bulbs. Large buildings use fluorescent lights not only for their efficiency, but also because less heat means lower air conditioning costs.

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What is the primary purpose of the argon gas inside the fluorescent tube?

The argon gas allows electrons to flow from the electrode at one end of the tube to the electrode at the other end.

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What is the purpose of the mercury gas contained within the fluorescent tube?

When mercury atoms move from an excited state to an unexcited state they give off ultraviolet photons.

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What is the purpose of the phosphorus coating on the glass of a fluorescent tube?

The phosphorus coating is responsible for changing the ultraviolet protons to visible light.

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What is the primary difference between neon tubes used on signs and fluorescent tubes?

Neon tubes use high voltage to produce light directly from neon gas and do not rely on additional gases or coatings.

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Why is electroluminescence a more efficient form of light production than incandescence?

Electroluminescence is more efficient because it produces light directly from electricity, rather than by heating a filament as in incandescence.

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The Indiglo light contained in a Timex watch is an example of:

The Indiglo light is a perfect example of simple electroluminescence. The watch uses an electric current to energize phosphor ions so that they emit a soft glow.

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How many lumens of light per watt does a standard florescent tube produce?

A standard florescent tube produces 50 to 100 lumens per watt, compared to 15 lumens per watt by incandescent bulbs. Not only are fluorescent tubes cool, they are very bright!

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How many filaments are contained within a three-way incandescent bulb?

The name used for a three-way bulb often throws people a curve ball. The three-way bulb contains only two filaments.

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The brightness of a three-way bulb is determined by:

The position of the switch on the lamp determines the brightness of the bulb. At the maximum position, both filaments are lit.

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What would be the typical filament combination inside a bulb rated at 150-watts maximum output?

A typical three-way bulb rated at a maximum output of 150-watts contains one 50-watt filament and one 100-watt filament. The low setting energizes the 50-watt filament, the medium setting energizes the 100-watt filament and the maximum setting energizes both the filaments.

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How much more efficient are fluorescent tubes in producing light than a typical incandescent light?

Fluorescent tubes produce four to six times more light than an incandescent bulb with the same wattage rating. The increased efficiency applies to regular tubes, circular tubes and the newer compact fluorescent bulbs.

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