Energy-Efficient Lighting Quiz

By Unknown

You know new light bulb rules are going into effect in many countries, but how much do you really know about the energy used to brighten your world?

1. Thomas Edison is credited far and wide with "invention" of the incandescent light bulb. But what scientist reported success with just such an innovation a year before Edison did?

    Humphry Davy

    Michael Faraday

    Albert Einstein

    Joseph Swan

2. The first spiral compact fluorescent light bulbs (CFL) appeared on the market in 1995. But when was the design invented?





3. Energy Star-rated CFLs use approximately how much less energy than an equivalent incandescent (standard) light bulb?

    25 percent

    50 percent

    75 percent

    100 percent

4. Which country was the first to phase out incandescent light bulbs?




    The United States

5. What does the Kelvin measurement of a light bulb mean?

    How much energy the bulb uses.

    How hot the bulb gets.

    What lifespan the bulb can be expected to achieve

    What color light the bulb gives off

6. Frequent on-off switching (five-minute cycles or less) can decrease the lifespan of a CFL up to how much?

    25 percent

    45 percent

    65 percent

    85 percent

7. To produce light efficiently, CFL bulbs rely on mercury sealed in a glass tube. The same toxic metallic element is used in the glass "fever" thermometers that have been mostly replaced by digital technology. Which of the following statements about their m

    Glass thermometers contain as much mercury as in 125 CFLs.

    CFLs contain as much mercury as in 125 glass thermometers.

    Glass thermometers contain half the mercury of a CFL.

    A CFL contains half the mercury of a glass thermometer.

8. All of the following are advantages of light-emitting diodes (LEDs) EXCEPT:

    LEDs cost half as much as incandescents for the same light output.

    LEDs typically use 90 to 95 percent less energy than incandescents for the same light output.

    LEDs often come with estimated lifespans of 10 to 20 years and tens of thousands of hours of use.

    LEDs work great for rapid on-off switching.

9. What is the internationally recognized unit for brightness of a light source (in other words, the light source's perceived power)?




    Color temperature

10. The new lighting standards that the United States will phase in beginning on January 1, 2012, will force U.S. consumers to use CFLs or LEDs.



11. Halogen bulbs are not as efficient as CFLs, but they do represent an energy savings over traditional incandescents. But what is a disadvantage of halogen bulbs?

    They don't last as long as traditional incandescents.

    They give off a colder light.

    They operate at higher temperatures than traditional incandescent.

    They contain mercury.

12. All of the following lighting technologies can help reduce energy use except:


    Recessed lights

    Motion sensors

    Low-voltage lighting