This is a 35w CDM-T Ceramic Metal Halide Lamp with a G12 base. The lamps are also known as CMH-T and HCI-T. The CDM-T are compact, single ended discharge lamps with a high efficiency. These CDM-T lamps maintain stable colour over their lifetime and emit a crisp, sparkling, white light. CDM-T lamps are frequently used in shops, shop windows, public buildings and offices. But can also be used outdoors within floodlighting and pedestrian areas. This CDM-T lamp is available in colour 830 and 942. Also boasts a 15000 average life and a lumen output of 3500 lumens. Boxed in 12s.