The packaging states an expected service life of 0.5 years when used approximately 3 hours per day. (With automatic lighting and 9 hours of darkness, that's 2 months. Less in winter.) Next time I'll try a longer-lasting solution. (The bulbs worked and were bright enough; I tried just handling fabric.) Nothing on the website said it would last more than 600 hours hence three stars. UPDATE: four lightbulbs, two at a time. Each lasted about three months. So be vigilant and such.
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