I was told that CFL light bulbs and tubes contain mercury. Is this true?
Yes, fluorescent lamps require mercury vapour to produce light. The amount of mercury is proportional to the size of the lamp or bulb. A compact fluorescent bulb contains approximately 5mg of mercury, while a 4 ft. tube contains approximately 12 mg. The mercury vapour is not emitted into the atmosphere unless the lamp is broken. The presence of mercury makes it even more important to recycle these items properly.