Richard,
RE: Amazon dimmer: Not all LED dimmers are created equal. I tried this exact unit (from eBay) after I'd given up on the Autometer LED dimmer. Trust me, I didn't set out to build a dimmer from scratch! Although this one seemed to be OK with lots of high power LEDs, the dimmer motion wasn't as linear and progressive as I was looking for (just like the Autometer dimmer), so I kept looking.
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