yes Bill, i too am curious, especially given examples of specific x-former design as specified in 680.23(A)(2) here,

Quote
(2) Transformers.
Transformers used for the supply of underwater luminaires (fixtures), together with the transformer enclosure, shall be listed for the purpose. The transformer shall be an isolated winding type with an ungrounded secondary that has a grounded metal barrier between the primary and secondary windings.

i believe, (although i can't seem to find it at the moment) that landsacpe lighting within a certian (10') distance of an outdoor hot tub also requires GFI protection of the branch circuit.

Having done this recently, i had the very same Q's.... [Linked Image]

The only angle i could possibly venture is of limited power (in oktomorrow's case 16x3.75= 60w)

heellllp!

calling all X-former pro's !!!