How can some reviews already guessed, I can also confirm this only. After 4 days, charging at full sun, as recommended by the manufacturer, the bulbs lit about 1 week shining brightly and are really beautiful to look at. I've always about 4-5 hrs. At night can burn so manually turned on and off. One night I forgot to turn off, but tentatively turned the evening afterwards. The result was that the lights were about half an hour luminosity, after which they were made. Then I turn them charged four days without activating it (middle / end of October) and the results were very poor, they shone only about 45 minutes and were then out again. After this result, I simply leave on automatically and light up every night after dark between 20 and 40 min. In mid-November. In the summer it will probably fold a lot better. However, I must say that some of the lights did not light up after only 2 months of use, but do not know if these are definitely faulty. Conclusion: For the price, I find the product ok, but expect that it holds at least 1 year long..
