Rust inside bathoom light?

[MaxP779]

This is the light ive had up for about a year and a half now:

http://www.amazon.co.uk/gp/product/B000OC5GI0?psc=1&redirect=true&ref_=oh_aui_search_detailpage

There was some rust inside it, also one of the 3 screws holding the light in place is rusty. What gives?

Ive used sandpaper to get rid of it for now but its just a temporary solution. Anyone know of a light that wont rust?

Also on a semi related note the outside light that I fitted next to my front door has rust on it... Got that from B&Q. Where can I find an outside light that wont rust?

 

[MaxP779]

Cheers guys, ill investigate IP66 rated lights because I like very hot showers and thats probably the reason for the rust.

That plastic light looks great too! Im a fan of function over form and for once a plastic solution to something might be the better option