I bought 3 8-pack of these, one of the boxes after a month don't last more than 3hr on, all of them received the same sunlight. So there's a big chance of you getting a box of the defective ones, sadly my replacing window was closed, but the customer support offered me a full refund which I will use to replace the defective ones, they look gorgeous and are pretty discreet during the day. Is nice to see company who care about their clients and try to ensure a good reputation in the market.