The Lutron "Maestro C•L" dimmer has different wattage ratings depending on the type(s) of bulbs being controlled. Its an electronic dimmer.

Specifically, when 100% incandescent or halogen it can handle 600 W, but when 100% LED or CFL only 150 W, with a gradual variation between these extremes for mixed bulb types.

Info from the specification sheet:

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(The wattage capability also varies based on the # of "sides removed" though I can't see in the docs what that means.)

Source: http://www.lutron.com/TechnicalDocumentLibrary/369613a.pdf

What is the reason for the degraded wattage capability when running LED bulbs?

And is this variation in wattage capability typical of this sort of dimmer?


Since dimmable LEDs don’t use active PFC for cost reasons, the peak/average current is much higher, called the crest factor, so conduction losses demand this de-rating of power limits in a Triac dimmer.

The last page gives examples of multiple dimmers on the side and why that causes further derating by how far “removed” from the load to line a configuration is possible. “Removed” here means shifted away from power input by cascaded dimmers.


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