How do you replace the bulb in a triangular under cabinet halogen kitchen light.?

here is a link to the exact unit: http://www.larkandlarks.co.uk/kitchens/kitchen-bedroom-lights/kitchen-and-bedroom-halogen-lights/triangular-under-cabinet-halogen-

i can get the bulb part out of the main casin but the bulb itself is enclosed in a metal housing. Please help!
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