Registered Community Design 000973912-0001. 40 Lumens per Watt output . Replacement lamp for GU10 halogen lamp. Lasts 10 times longer than an equivalent incandescent lamp (10,000 hrs). Suitable for use in Fire Rated Downlights . Maximum ambient temperature (Ta) 65 deg C. Non-Dimmable. If used with occupancy sensors these should be set to a 20 minute minimum.