100 watt hci t ceramic metal halide lamp with a g12 base also known as cmh t and cdm t hci t lamps are compact single ended discharge lamps with a high efficiency these hci t lamps maintain stable colour over their lifetime and emit a crisp sparkling light cdm t lamps are frequently used in shops shop windows public buildings and offices hci ts can also be used outdoors for floodlighting and pedestrian areas this hci t lamp is available in colours 830 warm white and 942 c