Discussion
Which lighting change reduced electrical load significantly?
Answer: C
Light emitting diodes use a fraction of the power of filament lamps for the same output. Discharge lamps genuinely are more efficient than halogen too, which makes the last option a real if smaller improvement. Halogen offered brightness rather than economy. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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