A friend told me today that he was looking for a bright penlight that he could hold in his teeth, and I quickly thought 4Sevens Preon 2. Then he said he want's an wide/narrow adjustment option, and I went blank. So, I'm hoping one of you fine people can assist me in the quest to find the perfect light! I'm thinking that a lumen level of about 100-180 is going to be about right for him, and would like to stay with the AA/AAA batteries for ease of use. Any ideas?