Lighting in Bathrooms

For electrical fittings the bathroom is divided into zones into by the NZ Electrical Code of Practice as below:

This video from Eurotech Lighting gives an excellent view of NZ Lighting Regulations in a bathroom
https://www.youtube.com/watch?v=kz45vCXO3sg

Zones about a bath


Zones  Enclosed Shower

Zones open shower

IP Ratings for Light Fittings
 

Zone 0	Zone 1	Zone 2	Zone 3
IP X7 AND Safety ELV supply	IP X4  Sealed Light fitting	IP X4  Sealed Light fitting	No IP Rating required

The X in the IP rating refers to the ability to resist dust and solid particles entering the light fitting.   This number is not specified but it should be at least 4.