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I work with LED's. Expensive ones used in pro sports score boards. They are expected to last a LONG time when people are paying that sort of money for them. When we want to dim them, we PWM them. Depending on the circuitry though, you can send different current through them for different brightness. I'd say you will likely get good resuilts from a standard dimmer on a 12V lighting system. Maybe not on a 120V system... For 6 bucks... TRY IT!
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