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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?

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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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