Are the lights you are after for a decorative effect or as a light source
for the garden?
If it's just decorative and you intend supplying them from the loft space
then I can't see why you can't use low voltage halogen fittings like the
ones used internally. The transformer would be inside and the fittings
should be shielded from the elements under your eaves.
If it's for lighting up your garden then you must be looking at a full size
halogen fitting such as a security light.
Perhaps a little more information as to the purpose of the fitting would be
For decorative purposes the following links may be of help although they are
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