In the Spec tab at http://maglite.com/shop/flashlights/comp...flashlight.html, under "Power Management" it indicates "No". Does "Power Management" equate to it being digitally regulated?? I don't know for sure, but I think it does, meaning the Solitaire is not regulated. I think...

If you compare the Solitaire's 47 lumen for 1 hour 45 minutes to a regulated light (in this case a 1xAAA from CountyComm), we see the following:
Quote:
Medium mode, 40 lumens output for up to 7 hours
Low mode, 1.5 lumens output for up to 55 hours
High mode, 145 lumens output for up to 70 minutes
I'll take 40 lumen for 7 hours over 47 lumen for less than 2 hours any day.