I purchased these approximately one week ago. I have had them outside during the day and at night I have left them outside or moved them inside depending on what is going on that day. It has snowed and rained during the last week and they are still working just fine. I haven't checked them at night every night, but all four of them have stayed lit up for the last 8 hours and are still going strong. I did make sure the seals were placed correctly after I turned the switch to on and closed the lids as the biggest complaint I have seen on reviews is that they are not waterproof. So far I have not found any negatives, but if there is any changes I will make sure to update my review.