My first reaction on seeing this post was to tell you to tell Please to code his own lights. But you probably need to understand English better to get it.
I use circles for my driftmeter, for my g-meter, and for blue lights when exiting pit lane, etc.
Basically, it's just a very oversized full stop.
Does have problems though when trying to place it. If a normal letter fills a grid say 10 high x 6 wide, in LFS a full stop fits inside the same size letter grid, but is placed at bottom right of grid. So when you blow up (increase) size of full stop, you're really resizing the whole letter font grid.
This means that in the normal 200 x 200 LFS text/button placement grid, even if you try place full stop at 0,0 it may appear on grid at 5,9.
The bigger you make the 'circle', the further to the right and down it will appear (unless of course LFS insim will accept a negative number to place things, which I've never tried).
Not a great explanation, but best I can come up with.