Philips Master SON-T PIA+ 600W E40, High Pressure Sodium Lamp, The lamp is designed with fewer welding points, making it more robust and resulting in lower early failure rates than with standard lamps, Base: E40, Tension: 110 V, Expected life: 20,000 h, Power: 600 W, Colour temperature: approx. 2000 K, Nominal luminous flux: 90000 lm, Energy efficiency label: A++