HOW STUFF WORKS
QUIZZES

FOLLOW US
Light's Out: Can you save cash by cutting off your lights?
by Staff
Do you know a watt from a lumen, or a CFL from a LED? Take our quiz and test everything you know about lighting, and perhaps learn a few things about saving a buck or two.

Which of these inventors built the first electric light?

  • Thomas Edison
  • Humphry Davy
  • S.B. Morse
  • Alexander Graham Bell

In which year did Thomas Edison file his first patent application for the “Improvement in Electric Lights?”

  • 1866
  • 1878
  • 1888
  • 1901

Which cartoon character was the first to use the light bulb over-the-head gag to denote a brilliant idea?

  • Bugs Bunny
  • Felix the Cat
  • Mickey Mouse
  • Homer Simpson

What are CFLs?

  • compact flexible lamps
  • compact fluorescent lamps
  • Canadian Football League
  • close-circuit fluorescent lamps

Which type of gas "recycles" tungsten atoms back onto the filament to increase the efficiency of an energy-saving incandescent light?

  • mercury
  • halogen
  • neon
  • nitrogen

What type of light do “warm” light bulbs give off?

  • greenish blue
  • yellow
  • white to yellow
  • white

Which of the following elements is a key ingredient in compact fluorescent bulbs?

  • carbon
  • halogen
  • mercury
  • nitrogen

What does LED stand for?

  • light emanating diode
  • light emitting diode
  • light energy diode
  • light emitting dioxide

Which of the following sets higher efficiency standards for basic light bulbs?

  • Energy Information Act of 1997
  • Energy Efficiency Act of 2001
  • The Energy Savings Act of 2007
  • Energy Independence and Security Act of 2007

How much energy is wasted in a traditional incandescent light bulb?

  • 10 percent
  • 40 percent
  • 50 percent
  • 90 percent

How much money could you save each year by switching 15 incandescent light bulbs to 15 energy-saving bulbs?

  • $50
  • $70
  • $80
  • $90

Which of the following measures how much light a bulb produces?

  • voltage
  • watts
  • megahertz
  • lumen

Which of the following types of bulbs are used in recessed fixtures and small track lights?

  • parabolic
  • free form
  • ellipsoid
  • reflector bulbs

What element in a CFL bulb can harm the environment?

  • mercury
  • carbon
  • iron
  • neon

How much energy can you save by using an LED?

  • 10 to 20 percent
  • 50 percent
  • 75 to 80 percent
  • 90 to 95 percent

Which of the following terms describes the use of windows and skylights to bring natural light into a home?

  • daylighting
  • moonlighting
  • recessed lighting
  • common sense

How much money do you think you can save in a year by replacing one 100 watt incandescent bulb with an ENERGY STAR CFL?

  • $6
  • $10
  • $20
  • $45

Which type of filament did Thomas Edison believe would work the best for his incandescent light bulbs?

  • carbon
  • tin
  • tungsten
  • iron

In a traditional incandescent bulb, how much electricity is actually converted into visible light?

  • 5 percent
  • 10 percent
  • 20 percent
  • 50 percent

In which decade was the first halogen light bulb produced?

  • 1950s
  • 1960s
  • 1970s
  • 1980s