The amount of light that is cast on a surface is called illuminance which is measured in lux this can be thought of as light intensity within a specific area.
7000 lux bright white light.
The light therapy patients were instructed to place the light box about one foot from their face for 15 minute sessions to start.
The study included 46 participants who had at least moderate depression bipolar.
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Here are the details of how the 7 000 lux bright light therapy was used in the study.
In the study 46 patients received either a 7 000 lux bright white light or a 50 lux light acting as the placebo arm of the trial.
The total output of visible light from a light source is measured in lumens typically the more lumens a light fixture provides the brighter it is.
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The suggested use of a 10 000 lux light box for 30 minutes is a guideline and it is suggested you start with just 10 minutes to gauge your own reaction to the bright light.
For some people this intensity of light can appear too bright while others may want to use their happylight for a longer period.
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