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Recycling light bulbs
Many types of light bulbs contain metals such as mercury. Examples include:
- tube- and compact-style fluorescent bulbs, including compact fluorescent lamps (CFLs);
- mercury vapor bulbs – i.e. high intensity lamps with blue-white, originally used as farmyard lights;
- metal halide bulbs – i.e. newer, more efficient high intensity lights; and
- high and low pressure sodium vapor bulbs – i.e. yellow lights used for outdoor security lighting.
Because these bulbs contain metals and toxic chemicals, they should be properly disposed of to avoid contaminating the environment or harming human health.
Compact fluorescent lamps (CFLs)
Compact fluorescent lamps are used extensively in homes and businesses, and, besides being recyclable, have many environmental benefits. Certified by the U.S. Environmental Protection Agency's Energy Star Program, CFLs use up to 75 percent less energy than a standard incandescent bulb, and can last up to 10 times longer, and save $30 or more in electricity costs over the life of the bulb. The EPA estimates that standard coal-fired power plants emit 10 micrograms (mg) of mercury to power an incandescent bulb over five years, in comparison with 2.4 mg of mercury to power a CFL over the same period of time. Using CFLs also results in reductions of other air emissions from power plants, including carbon dioxide, a greenhouse gas.
Mercury, lead and other heavy metals all have the potential to be hazardous wastes. If bulbs are broken, burned or landfilled, metals and other toxic substances can be released into the environment. This risk makes it important to properly dispose of CFLs and other light bulbs.
Despite claims by manufacturers that "green" lamps can be safely landfilled, CFLs contain trace amounts of mercury and should be properly recycled. While the amount of mercury in each bulb is small, mercury pollutes the air and water when it ends up in landfills or incinerators.
For more information on mercury and its environmental and human health effects, visit EPA's mercury page.
Too valuable to waste
Metals such as mercury and lead in light bulbs are valuable and can be recovered for reuse. However, recycling rates for CFLs and other light bulbs are low. According to a November 2004 report by the Association of Lighting and Mercury Recyclers, an estimated 70.8 percent of the mercury-containing lamps used by business and 98 percent of the lamps used in homes are NOT being recycled. As CFL use increases, it becomes even more important to make sure those lights do not end up in landfills or incinerators.
Because of the mercury or other toxic substances in many light bulbs, businesses and institutions are responsible for properly storing and recycling used bulbs that are considered hazardous waste. This would include tube-style fluorescents and CFLs. For more information on the requirements for businesses and institutions, refer to ch. NR 673, Wis. Adm. Code.
Wisconsin has no legal requirements for disposing of bulbs that come strictly from households. Household waste is not regulated as a hazardous waste identified in ch. NR 661, Wis. Adm. Code. However, the DNR encourages households to recycle bulbs when possible. Residents should check with their local county recycling program to see if there are local restrictions for light bulb disposal.
For more information, see DNR's guidance on safe lamp and bulb management.
Preferred handling option: recycle!
In most communities, there are several options for recycling used bulbs, including tube-style fluorescents and CFLs. The DNR recommends that even "green" fluorescent bulbs be recycled, because they often do contain measurable amounts of mercury.
For CFLs in particular, there are several recycling options. First, try to buy your bulbs at a store that will take them back for recycling. A growing number of retailers, including several large national chains, are providing this service, which makes it very easy to recycle old bulbs when you go in for replacements. If this is not an option, look into a clean sweep program in your area.
To find a recycler in your area:
- Focus on Energy has information on where to recycle CFLs.
- Contact your local recycling program to see if they provide for collection. Many county web sites may also contain information on recycling.
For more information on CFLs, including environmental impacts and recycling, visit:
- EPA fluorescent lamp recycling guidance;
- Energy Star/EPA's fact sheet on proper disposal of CFLs;
- DNR's guidance on management of "green" fluorescent bulbs; and
- DNR's guidance on safe lamp and bulb management.
To safely handle your waste lamps and bulbs, place them in the box they were purchased in or the special cartons provided by a recycler. For CFLs, make sure used bulbs are placed in sturdy cartons and store them in a safe place to avoid breakage.
The breakage of an individual CFL bulb does not require an official hazardous material response. Visit EPA's Web page about cleaning up broken CFLs.
For more detailed handling requirements, refer to ch. NR 673, Wis. Adm. Code.