Kosnic’s range of PowerSpot lamps are suitable for the most demanding of professional users and deliver huge energy savings over halogen lamps, without compromising on brightness . The lamps can replace common halogen lamps creating an ambience in accent and general lighting applications for hospitality, commercial and domestic applications, and once in place rapid payback is achieved.GU4 requires 12v dc constant voltage LED driver. Not suitable for halogen transformers. Save energy up to 85% compared with halogen lamp. Replacement for MR11 GU4 halogen lamp. Requires 12Vdc constant voltage LED driver. High lumen output. Long life of 30,000h. Instant start. Negligible UV output. Mercury free. Ambient temperature: -20° C to 40° C Peak Candelas: 250cd Dimension: Length: 37mm x Diameter: 35mm Safety and Maintenance: Switch off supply before installing or removing lamp. Allow to cool before handling. Do not use in totally enclosed fittings as this will reduce lamp life. Do not dispose of in household waste. Dispose of in appropriate section of local civic amenity site or recycling centre.