Ltpgtthis dimmer switch is from varilights v pro series which comprises intelligent dimmers with both trailing edge dimming by default and leading edge dimming modes the optional leading edge mode can be selected by the user and is more suited to certain types of load eg philips masterled in addition users can set the minimum load level for the dimmer to optimise the dimming range of a particular lighting loadltbr gtltbr gtcontrolled by a micro processor v pro dimmers o