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CFL Bulbs in 2026: The Health Questions, the Mercury, and Why the Answer Is Now Just LED
Finishes and upgrades Lighting From a builder
CFL Bulbs in 2026: The Health Questions, the Mercury, and Why the Answer Is Now Just LED
Ten years ago the compact fluorescent was the bulb the government wanted in your house and the one everyone worried about. Both of those are over. Here is what the worry was worth, what to do with the ones still in your drawer, and what we actually put in a house now.
Short version: Health Canada tested compact fluorescent lamps and found the ultraviolet and electromagnetic emissions well below any level of concern at normal distances (keep any bulb 30 cm from your skin for long periods), and the mercury inside, a few milligrams, is a risk only when a bulb breaks and the cleanup is careless. The real reason to stop thinking about CFLs is that LEDs are cheaper to run, last four to five times longer, contain no mercury, dim properly and come in every colour temperature. In a new house, every fixture should be LED; the remaining CFLs go to a household hazardous waste depot, not the garbage.
What a CFL is and why it was pushed
A compact fluorescent is a folded fluorescent tube with a ballast in the base: mercury vapour excited by the ballast makes ultraviolet light, and a phosphor coating turns that into visible light. Canada’s lighting efficiency standard, phased in from 2014, took most incandescent bulbs off the shelves, and CFLs were the cheap replacement at the time: a quarter of the energy, 8,000 to 10,000 hours of life against 1,000 for an incandescent. They also flickered, took a minute to warm up in a cold garage, dimmed badly, and contained mercury. LEDs fixed all of that within a few years.
The three health questions, answered
| Concern | What Health Canada found | What to do |
|---|---|---|
| Ultraviolet light | Small amounts, mainly from bare-spiral bulbs; not a hazard at 30 cm or more; a few people with UV-sensitive conditions can react | Use covered bulbs or a shade; keep any lamp 30 cm from skin for long periods |
| Electromagnetic fields | Measured at 20 cm, far below Canadian and international exposure limits | Nothing |
| Mercury | About 3 to 5 milligrams per bulb, sealed; no exposure from an intact bulb; a broken bulb releases a small amount of vapour | Clean up carefully (below); recycle, never trash |
If one breaks
- Get people and pets out of the room and open a window for ten minutes; shut off forced-air heating or cooling while you do.
- Do not vacuum; it spreads the mercury dust and contaminates the vacuum.
- Scoop glass and powder with stiff paper or cardboard, pick up the rest with sticky tape, wipe the area with a damp paper towel.
- Put everything, towels included, in a glass jar with a lid or a sealed bag, take it outside, and bring it to a household hazardous waste depot.
- Wash your hands. The next few vacuumings of a carpet, open the window again.
Why the answer is LED
- Energy: an LED uses about 75 to 85 percent less than an incandescent and 20 to 40 percent less than a CFL for the same light.
- Life: 25,000 to 50,000 hours rated; in a new house that is the bulb you never change.
- No mercury, no warm-up, no flicker from a decent driver, instant full light at minus 30 in the garage.
- Dimming and colour: choose 2700 K for living spaces, 3000 K for kitchens and baths, 4000 K for the garage and workshop; high colour rendering (CRI 90 plus) for the kitchen. Buy dimmable LEDs and compatible dimmers or they buzz.
- Integrated fixtures versus bulbs: integrated LED pot lights and strips are thinner and sealed (and the sealed, IC-rated kind are what you want in an insulated ceiling); bulb-based fixtures let you replace a failed lamp without replacing the fixture. We use both: sealed integrated pot lights in ceilings, standard bases in pendants and sconces.
In a new house
Specify LED throughout, sealed IC-rated recessed fixtures in any insulated ceiling (they are also the air-sealing fix for ice dams), dimmers rated for LED, and three layers of light in every room on separate switches. Lighting and outlet planning before drywall lays that out room by room; why LED deserves more thought goes deeper on choosing them. The box of CFLs in the basement goes to the hazardous waste day. The incandescents can stay in the oven and the fridge, where nothing else fits.
Related guides on this site
Sources and further reading
Questions people ask
Are CFL bulbs dangerous to your health?
Health Canada found UV and electromagnetic emissions from CFLs well below any level of concern at normal distances; keep any bulb 30 cm or more from your skin for long periods. The mercury inside is sealed and is a concern only if a bulb breaks and is cleaned up carelessly.
How do you clean up a broken CFL?
Clear the room and ventilate for ten minutes, do not vacuum, scoop the pieces with stiff paper, pick up dust with tape, wipe with a damp towel, seal everything in a jar or bag, take it outside, and bring it to a household hazardous waste depot.
Can you throw CFL bulbs in the garbage?
No. They contain mercury and go to a household hazardous waste depot or a retailer take-back bin. LEDs can go in electronics recycling.
Should a new house use CFL or LED?
LED everywhere: less energy, 25,000 hours or more, no mercury, proper dimming and instant light in the cold. Use sealed IC-rated LED pot lights in insulated ceilings.
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Reviewed and updated October 2026. Costs are Ontario ranges, not quotes; code references are to the Ontario Building Code in force at that date.
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