What's considered a keychain light varies by different people......
I have found any AAA light much too BIG for my keyring - so I carry a Photon 2 in Yellow on mine - the Photon 2 is a "nearly not there" size and weight - and Yellow mainly because of the very, very long runtime (used to be advertized at 120 hours - I had a Photon 1 also in yellow that was on my keyring for nearly 8 years until I retired it - and battery is still going strong now - probably nearly 10 years now....). Yellow also because it seems to least disturb any semi-dark adaption I have acquired - yet I seem to see well (contrast and definition) under yellow light - this could well just be conditioning since most of us see under yellow in room lighting and early morning and late afternoon light is also "yellow".
Anyway getting back to AA or AAA lights - with LEDs the possibilities of pretty bright single AA or AAA battery lights is a reality.
I regard single AAA or AA as "Pocket" lights, and EDC one in addition to the Yellow Photon 2.
Starting at the budget end the already mentioned Dorcy 1AAA is a bargain from a local WalMart @ $5.94.
A Classic Revisited - Dorcy 1AAA
I still EDC one as a pocket light - but beware the loop for the keyring has been cited by many as a weak point. Since I don't use it on a keyring it is not a problem for me.
Things have recently taken a quiet (but significant) leap forward in LED flashlights -
The
Fenix E0 (~$19.95 shipped) is a 5mm white LED light that's about 2x brightness of the previous generation 5mm white LED 1AAA lights (eg: the Dorcy 1AAA above, or the classic ArcAAA).
It runs on a single AAA battery that gets about 9-10hours of nearly constant output, and 11-12hours to 50% brightness and then gradually diminishing brightness out to 20+hours - this was unheard of only a few months ago.....
Fenix E0 "Dart" - comparison review
including comparisons with the Dorcy 1AAA and the classic ArcAAA (circa 2003)
If that wasn't enough, Fenix recently introduced the
Fenix L0P Special Edition (~$39.00 shipped) - this is a premium R-bin Luxeon light on a single AAA that has 3 levels of brightness. On high it is significantly brighter than the
Fenix E0 and the beam characteristcs and tint are going to be a lot better too.
It's an amazing little light (for now) with good runtimes.
I called it a gem among jewels of a flashlight......
Fenix L0P-SE Special Review
Fenix L0P-SE runtimes
Hope some of this helps,
--
Vincent
http://clik.to/UnknownVT2006
http://clik.to/UnknownVT2005
http://clik.to/UnknownVT2004
http://clik.to/UnknownVincent