A Philips MASTERColour 150w CDM-TD in colour 830 - warm white. This is a 150w CDM-TD Double Ended Ceramic Metal Halide lamp with an RX7s base. A CDM-TD lamp is a compact, double-ended discharge lamp with a high efficiency. CDM-TD lamps maintain stable colour over their lifetime and emit a crisp, sparkling, white light. CDM-TD\'s are frequently used in shops, shop windows, public buildings and offices. They can also be used outdoors for floodlighting and pedestrian areas.