Special offer buy 12 for just pound697 each 20 watt cdm t ceramic metal halide lamp with a g12 base also known as cmh t and hci t cdm t lamps 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 cdm ts can also be used outdoors for floodlighting and pedestrian areas this cdm t la