On 07/05/2019 21:34, Mike wrote:

I'm installing a LED floodlight outside below a wooden soffit. It would
be neat for the cable to go up to the soffit into a junction box where
the 1mm2 lighting can enter from the loft. So in effect like a ceiling
rose, but waterproof. I haven't found a j/b that expects a cable entry /
exit from its mounting surface. But I bet one of you have.

--
let the dog out.

A search for "adaptable box" might be useful but, as others have said,
it would be far preferable to enter from below (ooo, errr, missus!)
using cable glands and to have a slight loop so that the box/gland isn't
at the low point.