Lighting 101: Math – Can’t Argue With Numbers
Math Problem #1
LEDs operate at about 80 percent efficiency, meaning 80 percent of energy is distributed as light and 20 percent is lost as other forms of energy, such as heat. Incandescent light sources, for example, operate at about 20 percent efficiency. Using this knowledge, let’s assume you have an electric bill of $100 and you are currently using incandescent lighting in your home. $80 of your bill is used to heat the room, not to light it. Now say you switch to LED – your previous bill of $100 turns to $20 (wasted energy) and you save $80 (amount of light dispersed).
LED lighting generates the same amount of light at less than 50 percent of the operating energy costs as traditional fluorescent tube school lights. Current fluorescent lights also run on an average of 32-40 watts, while LED replacements for those tubes run on an average of 12-18 watts.
Math Problem #2
12.76 cents X 236.52 kWh saved = $29 per tube
Now if we look at a facility with 100 fixtures with 2 tubes per fixture (using the same numbers as above):
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