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I think that you have found the solution when you refered to the manufacturer for advice, and found that only some dimmers will provide full range dimming with the LEDs you are using.

A mains dimmer normally switches the mains to the load cycle by cycle, and varies the point in the cycle where it switches on to adjust the amount of power passing through.

Incandescent bulbs have a thermal lag as the there is an amount of metal in the filament that needs to be heated to incandescent before the filament will glow. Dimmers normally get around the delay that this produces by having a preset minimum of 5-10% of the mains cycle so the filaments remain warm but produce little to no light. Applied to LED bulbs, this will cause the issue you are having.

The packaging/instructions for the original dimmers might suggest a certain power level for incandescent bulbs and another for for LEDs, but unless they stipulate that they can achieve complete shuttoff for LEDs, they may not be suitable for your needs. In many applications, there is not an absolute need for them to dim to total darkness, and a low level of light is an advantage for safety.
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