I bought four of these lamps for outdoor lighting with motion detectors. After no one could answer my questions on the temperature range and number of switching cycles to me, I have dared to make a purchase and on the packaging I found the information: -20 .. + 40 ° C and 15,000 cycles. So far so good and for my application they seem to be suitable. Bright enough and they are good as 60W incandescent lamp replacement, even though I have not measured the brightness. I'll update this review in any case, my opinion about these bulbs should change.