I missed seeing that definition. Where's that at? Although the 3AAA form factor with carrier is more cumbersome, and the energy content somewhat less for the space compared to AA, that does not mean the lights have to be of inherently poor quality. Sure, there are many poor quality 3AAA lights, but then there are many poor quality AA lights with undesireable characteristics, too. I have the Ray-O-Vac headlamp that takes 1AA cell, and let me say I seldom use it because it goes through one cell every two hours and the light does not dim at all near the end, just blinks off. Surely someone can suggest a nice quality 3AAA headlamp for metlarules.