According to the NHS, it is thought the light may improve Sad by encouraging your brain to reduce the production of the hormone melatonin, which causes sleepiness, and increase the production of serotonin, a hormone that affects mood.
While Ms Cantrell said she has noticed a difference to her mood after using the light.
“It’s a very subtle change for me,” she added.
“What I notice is it’s almost like it’s taken an edge off those extreme reactions to things that are happening.”
Ms Cantrell, who works as a support services officer at the mental health charity Aware NI, urged people who might be experiencing the symptoms of Sad to contact their GP, watching what they eat, connecting with loved ones or even getting outside during the day.
“Even if it’s grey, there’s light there, there’s natural light there, go out and get some,” she added.