1. CE approval 2. 2 years guarantee 3. Efficienty: 83% 4. AC input ... , high light efficiency, low light attenuation 3. Confirm to EMC standard 4. 100% full load burn-in test by 8 hours ... , over voltage 6. All through long time, low tmperature and water proof test befor go out 7. Constant current design SPECIFICATION ... mechanical dimension. 20W 12v dc waterproof led power supply,IP67, CE approval