Because the electricity is converted into heat in the tungsten wire in the bulb. 90% of the electricity they produce is heat and only 10% is light. On the other hand, fluorscent bulbs use 40% of the electricity to produce light. If you are considering switching to CFL bulbs, I would highly suggest doing so. Many people complain of the hospital-like white light they produce, but as CFL’s have become more popular manufacturers have designed bulbs that emit a “soft-white” light.
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