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There are some lamps or light bulbs that are considered hazardous because they contain mercury. Universal waste lamps include fluorescent tubes, compact fluorescent lamps, high-intensity discharge bulbs, and neon bulbs. Recycling lamps is important because it prevents the release of mercury and allows the reuse of other bulb materials. Even though CFLs contain mercury, their use results in less mercury entering the environment than that caused by incandescent bulb use. Coal-burning power plants are the largest source of mercury released to the environment. So, powering the less efficient incandescent bulbs actually leads to a greater mercury release per lumen than disposing of used CFLs does.