After a few weeks, if you don't notice a difference , you can increase the time you spend in front of your light box up to 60 minutes. Make sure you only use certified light boxes and carefully follow the directions that come with your particular lamp for maximum effectiveness. 

While light therapy is safe to use and has a very high success rate (around 80% according to Anxiety UK) some people do experience side effects. 

Including: 

Headaches 

Eye strain 

Nausea 

Fatigue 

Typically , these side effects are harmless and will subside after the first week. However, certain medications can make you photosensitive and some people have poor reactions to light therapy, so speak to your doctor before beginning light therapy to determine if it is the right course of treatment for you. 

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