A light bulb converts electrical energy into light energy when it is turned on.
In denver, traffic signal lights are being converted to the new energy-saving bulbs.
Something in a traffic signal converts electrical energy into light energy when it is turned on.
What converts electrical energy into light energy when it is turned on?

A: Something found in a traffic signal
B: deoxyribonucleic acid
C: Something found in a hand mixer
D: Something found in a power strip
E: Something found in a hair dryer
F: polymers of nucleotides
G: a hemisphere is tilted away from the sun
H: an electron microscope