Compact flourescent lamps

More and more Canadians are replacing regular incandescent light bulbs with more energy-efficient products, such as compact fluorescent lamps (CFLs).

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About compact fluorescent lamps

Fluorescent lights have been around for a long time, and CFLs are the latest variation on the traditional tube fluorescent light. CFLs fit into a standard light bulb socket. Like the old-style fluorescent lights, they use a different method to produce light, which makes them energy-efficient. They are low-pressure, mercury vapour lamps that produce invisible ultraviolet (UV) rays. When the lamp is turned on, the mercury vaporizes inside the lamp and becomes 'excited' by the high voltage electricity. The UV then 'excites' the phosphor coating inside the lamp, which emits the light you see.

Radiation emitted by CFLs

With more Canadians using CFLs, some have begun to question their safety, including the level of UV emissions, the electric and magnetic fields (EMFs) they create, and the presence of mercury in the lamps.

Ultraviolet radiation

Canadians can be exposed to ultraviolet (UV) radiation from a variety of natural and artificial sources, including the sun, welding equipment, lasers, tanning equipment, and fluorescent lights. The incandescent lights that have been used by Canadians also emit UV radiation. UV can be beneficial: it can be used to kill germs and treat various skin conditions, and it is needed to form vitamin D in our bodies. At the same time, there are risks attached to all forms of radiation, and overexposure to UV has been linked to sunburns, premature skin aging, skin cancer, eye problems, and weakening of the immune system.

As noted above, fluorescent lights produce UV when the mercury vapour is 'excited' by the electrical current. However, the amount of UV produced is so small that it is not considered hazardous to your health. The results of the Health Canada study showed that, when either CFLs or regular light bulbs (incandescent) are used at a distance of 30 cm or more, UV emissions do not present a health risk to the general population. Health Canada recommends that people keep this minimum distance between themselves and any light source. When CFLs or regular light bulbs are used daily at 30 cm, exposure should be limited to no longer than 3 consecutive hours.

Although the amount of UV emitted by CFLs poses no problem for the average person, some people are extremely sensitive to UV and may be affected by the amount of UV produced by CFLs. Those who have Lupus or another auto-immune disease and certain skin conditions can be sensitive to the UV from CFLs, in the same way they would be sensitive to sunlight and other light bulbs that emit UV. If you believe you are suffering from symptoms related to UV, you should consult your health care provider.

Electric and magnetic fields

Electric and magnetic fields (EMFs) surround all electrical equipment from appliances to power cords to outdoor power lines. You cannot see or feel them. An electric field forms whenever you plug a lamp or an appliance into an outlet, even if it is not turned on. The higher the voltage, the stronger the electric field.

A magnetic field forms when the current is flowing through the wire or appliance. The greater the current, the stronger the magnetic field. Electric and magnetic fields can occur separately or together. For example, when you plug in a lamp, it creates an electric field. When you turn the lamp on, the flow of current creates a magnetic field, in addition to the electric field.

Like other electric appliances found in the home, CFLs emit EMFs. Health Canada has made measurements of the EMFs at 20 centimetres from the lamps, and when compared to departmental and international science-based guidelines, the levels of emissions are well below the maximum levels of exposure. Health Canada does not consider the EMFs from CFLs to be a health risk. This conclusion is in line with current international scientific opinion.

Mercury in CFLs

Mercury is the only existing element that produces the UV wavelengths needed to make CFLs work. While mercury is a highly toxic substance, only a very small amount is used in a CFL, about the amount to cover the tip of a ballpoint pen. There is no risk to your health when the lamps are unbroken. Even when a CFL is broken, there is a very low risk to your health, unless you mishandle it or store it carelessly.

Health risks

In the past, some people reported headaches or eye strain when using fluorescent lighting. Some could see a flicker in the lighting, caused by lower frequencies and magnetic ballasts. The newer CFLs use higher frequencies and electronic ballasts, which means the human eye cannot detect any change in the light frequency. There is also less of a 'hum' in the newer lights. The 'hum' in older lights may have caused headaches.

There have been individual reports of health effects such as headaches and depression from the use of CFLs. It may be possible that a small number of people are more sensitive to CFLs as noted above; the majority of people are not. Health Canada will continue to review the scientific evidence as it becomes available, and act if any potential risk is found.

Minimize your risk

Although CFLs are considered safe to use, here are some steps you can take to further protect you and your family:

Safe handling of CFLs

How to safely clean up a broken CFL

If you break a CFL, follow these directions for clean up:

Leave the room


Clean-up directions for hard and carpeted surfaces

Carpeting - steps to take after the initial clean-up


Government of Canada's role

Health Canada has studied UV radiation and EMF emission levels from CFLs. The study determined that CFLs, if used as directed, do not currently pose a health hazard to the general population from UV radiations and EMF emission levels.

Health Canada has developed a guideline document, commonly known as Safety Code 6, that specifies limits for safe human exposure to radiofrequency EMFs. The exposure limits specified in this document are based on an ongoing review of published scientific studies. Using the data from these studies, Health Canada sets the general public exposure limits at 50 times lower than the threshold for adverse health effects.

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