The light limiter or no bypass module used on a ceiling fan controls the wattage to the light kit.
Ceiling fan light power limiter.
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As per the energy policy act of 2005 all ceiling fans manufactured or imported into the united states must utilize a light bulb wattage limiter as of januar.
Obviously this is so they can comply with the energy conservation act by limiting the wattage of light bulbs and the types of bulbs that are used.