Even light bulbs have an energy rating, and this one is C-rated. On this light bulb you'll find a GU5.3 MR16 socket.
From Amazon
Osram 44865 WFL 35 W Halogen Lamp
Lamps 2U Direct
Twin Pack of Osram or Philips M281 12 volt 35 watt Flood MR16 50mm Halogen Light Bulb