The now discontinued Sofirn C01 is what you seek. AAA, 3400K Sophia 5mm LED, twisty one mode, 7-8 lumens. They were sold anywhere from $3.99 - $7.99 USD. They also manufactured a red LED version. Might be able to find some on the secondary market, like eBay.
AE seems to still carry the C01:
https://www.aliexpress.com/item/2251832781048604.html
Edit: The red anodized one has red light at 670 nm at probably less than 1 lm. The others are white.
I’m still looking for something similar that will fit my needs as well 
guess I better built it myself.
Has anyone bought a discounted light from AE. I don’t really trust they will actually send me the right light. It seams to be sold out everywhere else and it is not even mentioned on the sofrin website any more. Hopefully I can find one in 3400k and red, they are what I’m looking for.
But the AE shop is actually the official Sofirn shop. Look at the feedback, end of May a customer received the correct light.
Edit: Oh wait … the pictures show a C01S!
Thanks for the info!
Sorry, had to edit my post above. The pictures show a different light
oh to bad, I will try and find one used
What about a Sofrin SP10 Pro? Although it is a 1 AA light with Anduril 2. Not sure how well it would perform when the floor and ceiling set to the 5 lumen range.
I cant find the color temp of the flashlight. I need a very warm light.
It’s 5000 K, slightly green.
Thanks! That color temp will not work for my application. Still on the hunt for a dim warm light.
I think the Sofirn C01 is good if you can find it, or the Sofirn C01S if you never use the high mode.
I will look for a CO1, i want the warmer color temp. I think 4000k of the CO1S will not be warm enough for my use case.
I see you are in the US, S2000. Maybe you live near someone from here and that person can mod the SP10 for you, with a warmer LED.
It is hard to find the kind of light you are searching for, ready to buy.
+1 for the Sofirm C01 at 3400K from Sofirn Store on AE and they also have the Red LED in same form factor.
If you are so inclined and prefer more runtime, a warm 5mm LED tweaked to fit a 2xAA Maglite might serve your needs as well. The tweak is a matter of resizing the LED and reflector, then pairing with rechargeable constant 1.5V lithium you can get consistent regulated output for days.
Here is photo of 5mm Yugi 3200K Hi-CRI in -
1xAAA on left, Mini Maglite 2xAA on the right
Those gchart joule thief drivers are excellent. I swapped one into aNOS four sevens atom along with a 219b sw35. Just an awesome little light. I agree with others, though. Sounds like the Sofirn c01 is exactly what you want. Alternatively perhaps peak can make an Eiger to suit you?
Search for medical pen lights. Most have a very warm emitter, several good ones to choose from (and they aren’t priced like typical “medical” tools, thankfully). Lots of the weird-name cheapies do use a 5000K or 6000K emitter, though, but most of the med-specific stick to 3000K.
Weltool has a couple…not sure if the multi-mode brighter ones would suit you but single mode does limit your choices. Nitecore and Streamlight have some that I know are well regarded by EMTs and nurses, and seems like Wuben and Lumintop also have one (but I think the Lumintop may not have a suitable mode for you if memory serves).
Weltool does have a red one as well: https://www.amazon.com/dp/B09DCPX2D9/
The med-lights put out a very tight beam, btw, not at all like we’re used to with typical small reflectors. Best for very up-close viewing.
Try Walmart.
They will have some AA and AAA lights with very low lumens.