A single dimmer switch suitable for loads of up to 250W of incandescent lighting. This dimmer will replace any standard single light switch designed for 1-way switching & fits a standard single pattress. Not suitable for use with fluorescent lamps. A single dimmer switch suitable for loads of up to 250W of incandescent lighting. This dimmer will replace any standard single light switch designed for 1-way switching & fits a standard single pattress. Not suitable for use with fluorescent lamps.