To make sure you are using approved products, you need to look on the device for certification symbols like the CSA symbol or the ULc certification marks. The small c indicates certification is valid in Canada. Inexpensive, knock-off products run the risk of being a fire hazard and they often bear counterfeit certification logos. The best way to avoid these inferior products is to buy from reputable retailers, check for the certification marks and don’t be penny-wise-and-pound foolish.
The Electrical Safety Authority is advising that CFL light bulbs that become brown at the base as they age are not a hazard if they are certified for use in Canada. The ESA is concerned that it can be difficult for consumers to distinguish between what is normal bulb failure and what may be a precursor to fire or another hazardous condition due to knock-off, counterfeit certified products making it to our retail shelves. As a safety precaution, ESA encourages consumers to replace CFLs at the first sign of failure or aging instead of waiting for them to die. The early warning signs to look for include: flickering, a bright orange or red glow, popping sounds, an odour, or browning of the ballast enclosure (base).
The following chart can be used as a guide of certification marks for Canadian products.