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Xenophon, your example of the attic light bulb is an outlier. How many hours has that bulb been used? It may make sense economically to choose a cheap incandescent bulb only because it has little to no real overall effect.
But bulbs in the dinning room, bedroom, living room that are used much more frequently are prime candidates for CFL bulbs. Both economically in the long run, and in terms of energy savings on any time scale.
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