I once found myself out in the woods in the evening and it got very dark very fast. I was only a few hundred yards from the car but what little light there was dissappeared behind some clouds very quickly.
I had to use the backlight on my cell phone as a flashlight.
Now I have a penlight hooked to my key ring. It stays in my pocket.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.
Bob