Thank you for the detailed info! Extremely helpful in narrowing things down.
Sub-1 inch diameter is pretty standard for single 18560/21700 lights.
Throw is quite important for this purpose. A light that does ANSI 50 yards does NOT stay at a constant high intensity for all of 50 yards and then sudden cut out; rather, its intensity decays continuously over distance, and at 50 yards is as bright as moonlight, which is useless for disorientation. In other words: for two lights that can both reach over 50 yards, the one with more distance gives you more intensity (and thus more blinding power) at 50 yards.
For the purpose of disorientation, the beam needs to be simultaneously (1) intense for disorientation, and (2) wide for coverage and ease of aiming. These two requirements are in a tradeoff with each other, so you need to decide what’s a good balance. What beam angle would be good for you?
Forgoing the reflector entirely would not do; a reflector easily duplicates the intensity by anywhere between a few dozen times to a few thousand times. For the size of a D4V2, it is possible to build a light that simultaneously throws and floods better–the quad LED setup is very poor for throw.
Here’s a thread with more info about the LEDs. I personally use the tests by koef3 because he is still an active LED tester, which makes comparisons consistent. Basic data for popular flashlight LEDs summarised
A reflector and a TIR produce completely different beam profiles. A reflector gives a hotspot, 60-ish degree spill, and then abrupt cutoff. TIR tends to have a larger hotspot, and the spill is dimmer but wider. Here’s an example of a reflector and TIR in the same light (approximately your size) and same emitter, LH351D (which is on the floody, i.e., not very intense, side). Source.
