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The rating depends on the zone. If it's in a bathroom but outside the 'wet' zones then IP44 can be used. The 5 in IP45 stands for 'protection from water jets'. Perhaps you meant inside the zones.
Yes, I meant that the minimum requirement inside zone 1 is IP45, but IP65 is often used. I agree, it's better to actually understand the regulations.
ffm
In a small bathroom it's less of a consideration. On larger commercial jobs the cost adds up, some IP65 fittings are expensive.
The rating depends on the zone. If it's in a bathroom but outside the 'wet' zones then IP44 can be used. The 5 in IP45 stands for 'protection from water jets'. Perhaps you meant inside the zones.
I think that illustrates the problem with bathroom lighting and the over specification of IP ratings.
I understand your statement "people usually go for IP65" but that's not my experience. Some people definitely do but it tends to be a boot strap approach to the problem which avoids having to actually understand the regulations. Not that I don't make mistakes myself, it's a complicated regulatory environment which is easy to get caught out on, that's why the general rule that work in special areas needs signing off.