B22 4w led half mirror bulb with eec a from sylvania this half mirror bulb is perfect for mirror illumination as well as use in open lights with its modern design the bulb is a definite eye catcher whilst also being a loyal light emitter with a lifetime of up to 15 000 years with an energy efficiency class of a the bulb is up to 90 more efficient than other bulbs of the same brightness features has a warm white luminous colour of 2