You can find them at this store, and of course you can also buy direct from their manufacturer but you'll pay more than buying them from their dealers.
Triple Aught Design
$19.95 Arc-AAA
$11.99 Photon II
Photon II is cheaper but I look at it this way.....
Photon II is tiny little light while Arc-AAA is slightly bigger.
Photon II may be cheaper by $6 to $7 than Arc-AAA but I get more light out of Arc-AAA than Photon II.
Arc-AAA is rated to have a 5 hour runtime and I get bright light about 95% to 100% of its 5-hour runtime before changing battery.
Photon II is rated with burntime of 12 - 14 hours but tests shows that you'll only get about 1 hour prime brightness (about as bright as Arc-AAA) and 2 hours of medium brightness (significantly dimmer than Arc-AAA) and maybe 9 hours dimmer light you can use only to illuminate your door's keyhole about 3 inches away.
You'd probably change the batteries of your Photon II after 3 hours of continous use to maintain bright lights.
Now when changing battery time comes.... $1 can buy me 2 pcs. of AAA batteries for my Arc-AAA which I can buy from the corner store, grocery, supermart...almost everywhere. That's 10 hours of bright light for $1.
With Photon II I have to pay at least $2 for 1 pc of CR2016 lithium battery and you'll need 2 pcs. of CR2016 for Photon II which most likely I'll not find everywhere. That's 3 hours of bright light for $4,... 6 hours of bright light for $8,.... or 12 hours of bright light for $16.
Almost forgot to mention how easy it is to change Arc-AAA battery by just twisting the head to open and twist again to close. Did I also mention that Arc-AAA is waterproof?
With Photon II... be ready with small screwdriver and keep in mind not to lose the tiny screws and the little plastic switch. Also be very very gentle with the bended LED or you'll end-up messing its switch or it may not light at all.
Now you can do the math and pick which of the 2 is the better deal.
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