Interesting Post benthook.
I visit a couple Predator Hunting sites and sort of get a chuckle regarding the amount of $ guys are spending on lights.
If they got the disposable income - all the power to them.
If I may offer my 2 cents:
I don't believe in mounting a light to a rifle scope for scanning purposes (GUN SAFETY 101).
Besides the safety point, if you make too much movement with the gun while scanning chances are Wiley will bust you.
For the frugal KISS principle guys like me, I use a bit of Redneck Engineering:
Head Mounted Scan Light:
$20 Browning 3 mode LED Light that straps over your hat - uses 3 regular AAA batteries. I used a red Sharpie Pen to ink up the lens cover - no gel paper. I can pick up eyes well over 100 yards.
Kill Light:
$18 Coleman end-switch flashlight - uses 2 regular AA batteries. My custom gun barrel mounting bracket = black electrical tape which has proven to be bullet-proof (pun intended).
Here is a pic of my shotgun kill light:
The end switch is 1 inch from where my hand holds the gun. No pressure switch to F-up (like alot of them do due to broken/kinked wires). Turn the light on, pull the trigger.
Just thought I would offer up other less-expensive alternatives to the higher priced offerings on the market.
Only downside is that I don't have "Yote Killer" stamped on the light housings...