Plastic ceiling downlights

[highspark]

Does a normal hole saw go through these without cracking? Got some spots to put in and don't want to wreck ceiling

 

[GaryM]

The stuff you find in a bathroom? Or alternatively externally over garage canopy's etc?
If so then yes, a holesaw goes through without issue. Sometimes you'll find hollow gaps in the PVC which I've filled with silicone to help stop any cracking when putting in and removing downlighters.
I take it you'll be using LED lamps and not nice hot 50W halogen lamps?

 

[highspark]

Best to go with LED then? Bathroom mate.

 

[GaryM]

I would, either LED lamps in an IP65 fitting or Halers H2's.