Gu10 es50 hi spot superia halogen reflector bulb with aluminium reflector sylvania brand the havells sylvania hi spot high volt halogen bulb with gu10 fitting has many usage applications and offers new cost effective opportunities for lights superia es50 has the same diameter as a 12v mr16 bulb but due to its revolutionary design it works directly from the mains without the need for a transformer or special wiring the dichroic surface of the reflector allows the warmth of the light to