taxi and landing light focal point distances

[Flyfalcons]

If you aim your approach at the numbers, you're never going to use the full length of the runway.
Do not assume that the angle of the aircraft on approach equals the glide slope. I can almost assure you that you are at a positive angle of attack.

Flying at night into an unfamiliar airport, I'd rather be on the proper glidepath (aiming even further down the runway) and have obstacle clearance assured than worry about dropping the wheels right on the numbers.