Twindome (D14 x H16cm)3 holders in 1 (one for lighting, the other for heating). The TwinDome allows you to operate an Ultrasun 80/100 W lamp or a Neo Day Halogen 100 W for lighting, but also an Infrared Halogen 100 W or Terra Ceramic 100 W for heating. Ideal for the Mega Sun. Includes two on/off switches to allow separate control of heating and lighting