Registered Community Design 000973912-0003. 40 Lumens per Watt output allows compliance with the Building Regulations Approved document L1A/B requiring the use of energy efficient luminaires in dwellings. Special SGU10 lampholder prevents insertion of halogen lamps in compatible luminaires. Lasts 10 times longer than an equivalent incandescant lamp (10,000 hrs). Suitable for use in Fire Rated Downlights . Ta 65 deg C. Non-Dimmable.