Re outside 230vac...

Use an RCD protected socket spur
o an internal socket makes it easy to turn it off from inside
---- and cheaper than (say) MK-outside-RCD-sockets
o conversely it makes it easy for someone to turn it back on
---- so you need to ensure safety re isolation

For waterproof enclosu
o IP67 boxes exist
---- but require proper glands to be used for IP rating to be maintained
o Verify the transformer doesn't require much ventilation
---- ironically an encapsulated SMPS vs Linear PSU would be good

Note even IP67 transformers may NOT permit free exterior mounting:
o They sometimes specify an enclosure or non-water-immersion
o Reason is heating/cooling cycles draws water in around the cable

Not impossible to convert standard light fittings to low-power, eg,
bollards,
and wall lights using low wattage bulbs. Can be a lot easier where a large,
but distributed garden lighting arrangement is desired or required. However
don't go OTT on the bulbs re fitting big halogen into PL light fittings. Can
be a cheap way of getting light, via LV, without some of the high prices.
--
Dorothy Bradbury
www.stores.ebay.co.uk/panaflofan for fans, books & other items