I'm installing an LI Quad HP on my BMW next week, along with the STi-R. I've been impressed by others' installs and especially their care (and the importance of) the alignment of the heads.
This has caused me to reflect on how LIs work, then on the LEO pinging the car from a significant off-axis direction, such as on the bend of a road.
I think I've read here that at 600 yds the beam is 18" or so in diameter, is that right? And therefore I understand the importance of having the beam pointed straight ahead, not to the side, center, down or up.
But if this is true, then how can the return beam deal with the off-axis situation. Seems like the beam would be on-axis and not wide enough to have an effect.
Sorry if this has been asked before. I searched on off-axis but couldn't see a thread that explains this scenario.
Thanks in advance,