GU10 or GU5.3

[Decker]

In my house all my downlights are gu10 with the ones in my bathroom having a (steam?) cover over them except for the one over the sink which appears to be a gu5.3 fire rated downlight.
Is there any reason why this single list would be a GU5.3 as opposed to a Gu10 and also why it would be a fire rated downlight where all other downlights are not. The house is 8 years old and I assume had downlights from when it was built.
My only guess would be something happened with this particular light fitting and it was changed, unless there is another reason?

Any ideas?

 

[DaftPunk]

Is the 12V fitting nearer the bath or in a lower section of ceiling than the other 230V lights?

 

[Decker]

The ceiling is all the same level and below shows a plan of the bathroom with the location of the different light types
View media item 84207
From what I have read there seems to be no real reason why one light is different to the others, but it is only from what I have read - I am not expert at all.

 

[winston1]

Perhaps they all started off as GU5.3 12 v units and as the switch mode power supplies failed they were changed to 240v GU10 units.

Another possibility is that the lamp over the basin was added at a later date.

 

[Decker]

Thanks Winston1, I think that it was just added at a later date as all other downlights in the house (about 20-30) are 240v GU10 units.
Just wanted to check there was not a regulation issue.