Fact 1: Alight bulb converts electrical energy into light energy when it is turned on.

Fact 2: In Denver, traffic signal lights are being converted to the new energy-saving bulbs.

Given the two facts above, answer the question "What converts electrical energy into light energy when it is turned on?" with the following options: 
- Something found in a traffic signal
 - deoxyribonucleic acid
 - Something found in a hand mixer
 - Something found in a power strip
 - Something found in a hair dryer
 - polymers of nucleotides
 - a hemisphere is tilted away from the sun
 - an electron microscope


 

 Something found in a traffic signal        