For sleep benefits, people should incorporate light therapy into their daily routine and try to limit exposure to bright blue light. This is especially important in the hours before you go to sleep. With consistent use, light therapy users may see improvements in sleep outcomes, as demonstrated in peer-reviewed clinical trials and reviews. [1]
Conclusion: Consistent, Daily Light Therapy is Optimal
There are many different light therapy products and reasons to use light therapy. But in general, the key to seeing results is to use light therapy as consistently as possible. Ideally every day, or 2-3 times per day for specific problem spots like cold sores or other skin conditions.
Sources and References:
[1] Morita T., Tokura H. “ Effects of lights of different color temperature on the nocturnal changes in core temperature and melatonin in humans” Journal of Physiological Anthropology. 1996, Sept.