Higher voltage: more light, shorter service life
When the specified operating voltage is exceeded, halogen lamps produce more light but their service life falls considerably. When the voltage actually used exceeds the optimum operating voltage by even just five percent, the service life falls by 40 %. Thus 230 Volt halogen lamps, commonly used in Germany, should not, for example, be used in Great Britain, where 240 V is used. Increased luminous efficiency is also possible at a higher voltage. Therefore halogen lamps should only be used in the specified voltage range, in order to achieve optimum results.