How about the Olight i3S EOS?(Image removed from quote.)
I can't think of any right now, but if you want the DIAMETER to be similar, then you should think of some special button cells or other type of cells or charging mechanism... or a USB charged flashlight. I'm not familiar with the pens you mention, but since it's a pen, I doubt that an AAA battery + the flashlight =/< then the diameter of the case.
My Smiling Shark 3W SS-5049 is pretty good... small and ridiculously cheap.Size: 12.5x1.3cmWeight: 31g (not included battery)My Led Lenser K2L is 6 cm long and weighs 21 grams.
If the diameter is the deciding factor, then like N_N_R says, probably all AAA lights are going to be too fat, just because of the battery size. Maybe have a look for an AAAA light instead ? Of course your battery choices are limited in that size.Here is an older discussion about AAAA lights:https://edcforums.com/threads/any-aaaa-lights-on-the-market.85557/Don't get too excited about the Klarus Mi X5, they seem to have all gone some time ago.Here's one that you can actually buy now (but it only has a 5mm LED so not very bright):http://www.batteryjunction.com/streamlight-stylus-3-opt.htmlThese might give you some ideas
thrunite T01 probably smallest AAA, 125 lumens very nice light, check amazon currently about $10(Image removed from quote.)like the other guys said you wont get the diameter of spacepen with AAA, but this light is about 1"shorter than pen(closed)my suggestion is keep pen in that holster and put one of these on key ring, u wont even notice it, or grab Jetbeam mini, very tiny and micro usb recgaragablehere is both side by side, great lights:(Image removed from quote.)
Quote from: Smashie on January 07, 2017, 05:17:03 PMHow about the Olight i3S EOS?(Image removed from quote.)Just ordered one. That one in fact. We'll see, it'll be cutting it close for sure. Especially because the head of light is even a tad bigger. But I've been eyeballing that little light for a while now anyway. Thanks for the comparison picture.
Quote from: kaput on January 08, 2017, 07:17:53 PMQuote from: Smashie on January 07, 2017, 05:17:03 PMHow about the Olight i3S EOS?(Image removed from quote.)Just ordered one. That one in fact. We'll see, it'll be cutting it close for sure. Especially because the head of light is even a tad bigger. But I've been eyeballing that little light for a while now anyway. Thanks for the comparison picture. Just to put your mind at rest the diameter of the olight is 14mm and the space pen (with clip) is 12.3mm, sorry I don't do imperial. Good choice BTW