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I've used 20 ohms as my lower limit.  In measuring the temperature of the smoke triac after operation of the smoke unit for 15 minutes on 18V track power, it was at 85C.  Getting warm, but well within it's operating range.  Dropping the resistor to 18 ohms it shot up to over 100C, too warm for me to be comfortable with that long term.  Some folks have suggested 16 ohms, that warmed it up to over 120C, way too hot IMO.

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