Osram 4052899973381 is a product number for the Osram Halogen Classic B Plus energy-saving bulb, which offers more energy-efficient lighting than standard halogen bulbs. This product has a base type of GU10 and consumes 35 watts of power to deliver 420 lumens of light output. It has a rated average life of 1000 hours and features a warm white color temperature of 3000K.