[ QUOTE ]
The_LED_Museum said:
A 365nm LED ought to do the job here.
I don't have a cat though, so I cannot verify this firsthand.
[/ QUOTE ]
Cat urine tends to be more concentrated than, uh, the other kind, which is one reason why it smells strongly. Thus any UV lamp that is able to reveal other types of urine will probably do really well on the feline kind.