See where you're commin from Robin.
I dont know If the way xenons operate make them cooler or hotter than conventional lights but I'd like to believe that LaminX had put some thought into that when developing.
The only evidence on it being upto the job is the various threads I've seen with it in use and never discussion of any 'melting' or any other kind of problem. *edit Thinking about it, using it myself on fogs that may get very hot hasn't caused any issues either.
With regards to light output. I know first hand that the dark smoke tint seems to have reduced the output of my fogs which seems stupid so I've bought some yellow to try which I've read is meant to intensify the light. While still giving a 'style' element.
The light smoke I've seen on Gazs' S3 and Aaron's Cupra and love the effect. I asked about the light output and both told me it wasn't reduced or not to a noticeable level