I must say you have very good taste in Color selection for your Gallardo... Congrats you will love it!!!
Now that you have the windows tinted - what about the front headlights
Here is a pic of my Gallardo with the front Headlights tinted - 25% (looks darker on photos than in person - up close you can still see the bulbs/headlights... Does cut back on night vision with low beams (probably about 25% oddly enough - High beams still are very bright and no issues...
I was actually thinking that those pics are without the tint... at 50% that is pretty much blackout from a distance (even with the sun).
Look at the front angle of my shots above - this is with no window tint - my windows (which only have tint from the factory) no aftermarket - look as dark as these...
This is a pic in my garage - the opener lights are on as well as overhead lights..
Which makes me wonder was factory tinting an option possibly... I am looking at my window sticker it doesn't show it - but looking online at other photos some do appear darker (even in bright sun) than others (minus color interior effect, etc.).
I picked mine up new - so I know it hasn't been tinted - and there is no film..