Fluorescent lamp
The mercury inside the tube is toxic and makes these bulbs hazardous waste. The bulbs must be taken to a recycling center after they stop working. During normal use, the mercury cannot escape, although it will escape if the bulb is broken. If a single bulb breaks, it is not usually a problem. It is recommended to open windows to air out the room, and to clean up broken glass with duct tape instead of a vacuum cleaner.