Smallest Light fitting that allows interchangeable bulbs?

[Pgeddon]

what is the smallest diameter light fitting you can get that is ip65 and allows an interchangeable gu10/mr16? or other bulb type thats smaller than that.

We're having the tile holes in the steps for a sunken bath today so good to know what the smallest we can get away with without the light having to be a sealed unit.

 

[Sharpend]

I would suggest that a gu10 light in a sink step would be too large? I think you would be better with the 20mm decking lights? The light will not be so in your face?
Something along lines of
https://www.tlc-direct.co.uk/Produc...MI4_jb9OfU9QIVjbTtCh2CZAAfEAQYAiABEgIHRPD_BwE

 

[Pgeddon]

Yes they're a good shout. I was just hoping there'd be something out there that's nice and small but also would let me interchange the bulbs as they're going to be sat in a tiled step. If they fail I cant be bothered pulling em out and having to re-seal/patch up everytime.

They'd have to be low voltage too as they're quite low down in a bathroom/near a bath.

I did want to ask about G4 lights though, is there not a light holder thats much smaller diameter that could hold one of these?