If I could see how to turn it off from a distance, I would quickly walk over and turn it off. Some lights require a twist of that or a push of this and would be very conspicuous trying to turn it off. I would be very grateful if someone did that for me. I have three forward facing lights that are VERY bright and even though I use the low setting, leaving it in the high setting would burn the batteries in less than an hour (3 AAA). While I do get them at Costco (like 50 at a time), that is still saving me some. But if I saw someone getting close to my bike and standing there for a while, I would get a little anxious. I don't mind people getting near my bike (got some interesting stuff there!).

I have left my lights on a few times but they have all been at home. Like when I go inside with the intention of coming back out to do something, but never come back out. I have never left them on while somewhere else though, as I do a walk-around before I go to where I'm going (to make sure both the bags and bike are locked up.