70 watt 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 tds are frequently used in shops shop windows public buildings and offices they can also be used outdoors for floodlighting and pedestrian areas this cdm td lamp is available in colours 830 and 942 boxed in 12s