There are additional attributes for robust, compliant LED supplies. Advanced Energy supplies typically have efficiencies of up to 93%, while some products in the market are as low as 80% efficiency. The table on this slide shows the dependency of efficiency with load and input voltage. Over temperature protection is needed to shut down the supply when a combination of ambient plus internally generated heat exceeds safe limits. Advanced Energy supplies are designed with an MTBF in excess of 2 million hours, and a lifetime of 80000 to 110000 hours over an operating temperature range of -35°C to +70°C. Due to their high lifetime and MTBF, all Advanced Energy LED power supplies are backed by a 5 year warranty.