With the many positive reviews, it is not clear whether they also refer to an improved mood, or what in particular is positive, since one does not buy them for aesthetic reasons.

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Accepted Answer

Hello,

I am a user of a light therapy lamp myself and can only recommend it to you. Especially in the dark season, such a lamp improves your mood and well-being. I am more awake and have more energy. Read more at https://de.wikipedia.org/wiki/Lichttherapie

Answer

if you want light go outside then you don't need a lamp

Answer

A lamp for light therapy is only of use to you if you do not get enough light in normal everyday life. 
A lamp should have an output of 5000Lx or more. However, many home devices are nothing and produce more of a placebo effect than anything else.
Light therapy is for people with seasonal depression or "lows" and should be discussed with a doctor.

Otherwise, I recommend taking short walks in the fresh air instead of sitting in front of such a lamp.

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With the many positive reviews, it is not clear whether they also refer to an improved mood, or what in particular is positive, since one does not buy them for aesthetic reasons.