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chrisbmx116-
Yes and no. I have no actual experience of installing bathroom lights. I have no sense of what people actually install. I've just finished my course which included a big design project including a swimming pool, and with my limited knowledge I feel like if I was going to the effort of changing a light, I'd probably want something that seems protected from the environmental conditions. In this case IP65 seems about right.
Thinking about it, the downlights in our bathroom kill bulbs relatively quickly - I suspect they aren't IP rated to any degree. But I know that a lot of the electrics in here aren't up to the regs.
Nef
I had a quick look in section 7, it doesn't specify IP requirements for outside of zone 2. However it seems fairly logical that you'd want something splash proof and something that won't get damaged by steam over time. Because the water part of the IP code (second digit) generally seems to refer to jets of water, then to submersion, it's a bit hard to interpret what would suit best, but in my mind, IP65 which is dust tight and protected against low pressure jets from all directions seems fairly sensible.