Dimmer Switch White 1 gang 2 way 60W - 400W Fittings included Powermaster 1 Gang 2 Way Dimmer Switch | 1379-28 The Powermaster 2 Way Dimmer Switch - 1 Gang has a max load of 400 watt and a minimum load of 60 watt. It fits a 32mm or 47mm standard singe box, and is compatible with transformers, standard bulbs, GU10 and mains halogen bulbs. It is one switch for up to two light fittings. It requires standard installation tools and should only be installed by a competent, qualified person.