My sister in law from Ohio uses one each winter she spends several hours each day to lift her out of sad . My wife in Florida had a windowless office and she had to put daylight bulbs over her work area to help with the same thing . So yes it can help .
So in Canada would be even more necessary . I live in Florida and when I travel to Ohio in winter its gets very depressing , the grey skies and clouds when flying in are reasons why I could not live there any more . I am outside almost everyday here .