Well, I never got the
official test started... but today I reached for the Arc LS while looking for a special homebrew plug for my computer's audio stuff (external amp, subwoofer, speakers, etc.) to bring my system back up to snuff after being destroyed last winter... and
OH OH!!! I accidentally left it burning on a closet shelf... then I fell asleep on the couch.
Several hours later, when I woke up and headed for the kitchen, this bright light was already shining on the wall - it was the Arc LS of course. And it was still bright.
The batteries will of course have to be replaced before "official" testing begins.
But here's some early info that us testers will probably find out sooner or later and the end user might want to know about - the thing gets pretty darned tootin'
toasty after awhile!
If I had a thermocouple, I could put all guesses aside... but I'd say the head was at around 55°C (~130°F) and the body (the 2 AA module) around 45°C (~116°F). Very warm (bordering on hot towards the head) but not so hot you couldn't hold it without twisting your face all up and crossing your legs all funny.
It was very likely even warmer sometime during that first hour when the batteries were strongest, but probably not by more than 5° or so. It was loaded with Energizer lithiums (the red & gold kind) that had been used in the LS already, intermittently, for around an hour total.
Just so you know... that growing warmth in your pocket isn't your workmate pissing in there - you probably just left your LS burning!