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In general, the brighter the light, the shorter it will take to use. With the most efficient lights (e.g. powerful SAD light boxes designed for 10,000 lux at arm’s length) you only need about 30 minutes or less per day.
Mid-power lamps (approx. 5000 lux at arm’s length) last approx. 1 hour and appeal to a wide range of users.
Most people find that light therapy works best in the morning. If you don’t feel luminelix isn’t working after a week of mornings, introduce another session later in the day.
If you don’t have time for therapy in the morning, it’s still better to use a light in the afternoon than not to use a light at all. However, try not to use your light late at night (i.e., within 3 hours of bedtime) as you may have difficulty falling asleep.
It really depends on why you are using light therapy. For example, if you work in a dimly lit office, you will likely use your light every work day to make up for the lack of natural light. If you have SAD, you likely have one session a day before the light, maybe even two a day in the darkest part of winter.
Even in winter there can be days when it is light outside. If you can get out and make the most of it, you may not need additional light therapy that day. As spring comes and the days get consistently lighter, you will likely find yourself using your light less and less.
Glasses or contact lenses are okay to use if they’re clear. Sunglasses, photo-sensitive or tinted lenses will reduce the effectiveness of light therapy.