Overvoltage protection up to 4,000 V , No premature failures: SecureSolderConnect technology prevents hairline cracks and cold solder joints , Unique: Integrated, temperature-dependent power regulation to 50% to protect against overheating , AirFin cooling: 2.5 times larger cooling surface than comparable products and up to 20% reduced weight load on the lamp base , Easy replacement thanks to retro-fit E27 socket for common HQL/NAV lamps , Optimally arranged LEDs enable even light distribution , Lamp can be operated without conversion on HQL ballasts and also directly on 230V. NAV ballasts must be disconnected. , Lamp efficiency of up to 135 lm / W through the use of high-quality Lm80 validated LEDs ,