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When a product becomes mainstream and is sold/available easily, the price will generally decrease. It will likely just take a while for them to be as mainstream as regular light bulbs.
There are ways to maximize the efficiency of CFLs, including awareness of the ambient temperature surrounding the bulb and how long the light will remain on. In particular, CFLs work most efficiently within the temperature range designated on the package, which will depend on whether the bulb is designated for indoor or outdoor use. Also, the CFL will be more efficient when left on for longer periods of time, rather than repeatedly turned on and off.
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