1st post in this Fred , its been a good read .
Last night we had Fog and recalling this discussion i opened the front door and poked out the XML-T6 Ho out there pointing at a small tree/bush about 40m away and around 15ft diameter.
It was a fairly bright night due to the Moon being up and the tree/bush being very faintly highlighted from the back-ground (could just see it with eye no torch) , to my surprise on MAX the tree and everything disappeared due to the bounce-back , tried high then medium and it was the same , i was very disappointed , i thought low would get there by then but nope! , then lighted up the 5d halogen and YEP , could see the tree/bush and bounce back was far reduced.
Please do not even bother with the beam/focus/intensity routine as i have tried a few over the months and noticed the same .
I have noticed this same phenomena on clear nights when one would think just by the feel that there is no humidity/moisture about , LED's are a good indicator if any sort of moisture is in the air with bounce-back , without a LED i would have never known that there was/is and i thought i was a fairly good judge for humidity and dry nights clear or not , but they show up something that seems to be floating about , and with smoke i would guess it would be even worse , even just smell-able smoke , imo.