This is a 35w CDM-TD Ceramic Metal Halide Lamp with a Rx7s base. The lamps are also known as CMH-TD and HCI-TD. The CDM-TD are compact, single ended discharge lamps with a high efficiency. These CDM-TD lamps maintain stable colour over their lifetime and emit a crisp, sparkling, white light. CDM-TD 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-TD lamp is available in colour 830. Also boasts a 15000 average life and a lumen output of 3500 lumens. Boxed in 12s.