Film sticks to the outside of the light cluster glass, and covers the complete cluster.
So there's effectively 4 clusters on our Leons, 2 on the outside, plus the 2 on the inside (in the tailgate).
The film on the roll looked a gloss silver colour, however once applied, just offers a nice glossy tint.
It's not "blacked out" like you might see done on the Corsa's

but takes away the bright Red look of the rear lights on the Mk2 Leons. Looks alot more stealthy on my Black Leon.
Will see if i can get pics up at some time.