RETROFITprotect - E27 LED bulb E27, 28 W The RETROFITprotect LED street lamp provides powerful light with uniform light distribution on all sides. It has overvoltage protection up to 4,000 V and is equipped with temperature-dependent power regulation to protect against overheating. Conventional HQL/NAV lamps with E27 bases can be easily replaced by the RETROFITprotect lamp, as the LED bulb can also be operated directly on 230 V without conversion to HQL ballasts. However, NAV ballasts must be disconnected. SecureSolderConnect technology prevents hairline cracks and cold solder joints, thus preventing premature failure - Ambient temperature during operation: - 40 °C to + 45 °C