Philips Master SON-T PIA+ 250W 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: 100 V, Expected life: 20,000 h, Power: 250 W, Colour temperature: approx. 2000 K, Nominal luminous flux: 33000 lm, Energy efficiency label: A+