Approximately 20 total hours burned this light until it gave up the ghost with me. As with other reviewers also only very slight blue glow was seen then in the dark. When the light was still working, this shimmering, incidentally, was also seen in the off state (at Dunkellheit). I would take the place of the company Brennenstuhl this thing in this form as soon as possible from the market. It ruined obviously a significant proportion of buyers the otherwise very good reputation of the company.