Mr16 10 w 927led bulb with external driver dimmablethis compact mr16 led bulb 51 mm diameter from ledon can be used in almost all recessed spotlights for gu53 or gu10 bulbs due to the external led driver included the bulb can be superbly dimmed to create different atmospheres the extraordinarily good colour rendering index of ra90 whereby the colours appear very naturally and the extremely high light output of 600 lumens which corresponds to a traditional halogen reflector bulb