EX0-111 · Question #79
You work in a typical office building and the lights are always on. Using which lighting source could make the most significant dent in energy use?
The correct answer is A. 30-Watt Fluorescent bulbs. Switching to 30-Watt fluorescent bulbs (A) achieves the greatest energy reduction because they combine two advantages: fluorescent technology is far more efficient than incandescent (producing the same light output at a fraction of the wattage), and at 30W they draw 25% less…
Question
You work in a typical office building and the lights are always on. Using which lighting source could make the most significant dent in energy use?
Options
- A30-Watt Fluorescent bulbs
- B40-Watt Fluorescent bulbs
- CIncandescent bulbs
How the community answered
(28 responses)- A79% (22)
- B14% (4)
- C7% (2)
Explanation
Switching to 30-Watt fluorescent bulbs (A) achieves the greatest energy reduction because they combine two advantages: fluorescent technology is far more efficient than incandescent (producing the same light output at a fraction of the wattage), and at 30W they draw 25% less power than their 40W fluorescent counterparts. Option B is wrong because while 40W fluorescents are still efficient, the extra 10 watts per bulb adds up significantly in an always-on office environment with many fixtures. Option C is wrong because incandescent bulbs waste roughly 90% of their energy as heat rather than light, making them the worst choice for energy reduction regardless of wattage. Memory tip: Think "lower watts + fluorescent = lowest bill" - in a space that never turns off, every watt saved per bulb is multiplied by thousands of hours a year.
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