I'm looking for an adjustable flood light which can go from very wide to very narrow flood to spot, multiple modes starting with something low like 5 lumen, runs preferably on AA's (oherwise CR123) and with a diameter in between 18mm to 22mm to fit the fenix headband. I prefer something that runs on AA's since I wear glasses and the extra lenght means it will reach further ahead and avoid causing glare. Any suggestions?