Longest runtime light @ ~10 Lumens?

Just as the thread title states, I'm asking what light has the longest runtime while producing ~10 lumens. Specifically, lights that run on AA batteries. While posting, please try to provide other useful information, such as manufacturer, whether or not it is regulated, etc. Thank you very much in advance.
**EDIT** For clarification: 1 or 2 AA's, just list the manufacturer, etc.

How many AA batteries?

1? 2? 8? 24?

Probably a Cree MC-E or SSC P7 running at a regulated 20mA... That's not reasonable though..

You would be hard pressed to get better efficiency at around 10 lumens than the Fenix L1D or L2D Q5 / LD20

The L2d lacks the versatility and ultra-low low of other light but its efficiency is second to none.

Selfbuilt 2AA roundup:
https://www.candlepowerforums.com/threads/214890

Pro'lly the 2AA Nitecore D20 near it's lower setting.

Marduke said:

How many AA batteries?

1? 2? 8? 24?

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What is the model number and manufacturer of the flashlight that requires 24 (2 dozen) AA batteries?

sabre7 said:

What is the model number and manufacturer of the flashlight that requires 24 (2 dozen) AA batteries?

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Well, you could fairly easily load 24 into a 6D Mag with NiteIze dropin.

Granted, that is a bit on the extreme side of "longest 10lm on AA's", but I was making a point.

EngrPaul said:

Pro'lly the 2AA Nitecore D20 near it's lower setting.

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The NC D20 PWM based driver isn't as efficient as the constant current driver of the Fenix lights. There is also the problem of not really knowing when you are at 10lm. Guess wrong and you could half your runtime.

cave dave said:

The NC D20 PWM based driver isn't as efficient as the constant current driver of the Fenix lights. There is also the problem of not really knowing when you are at 10lm. Guess wrong and you could half your runtime.

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If the fexix go that low... :thinking:

EngrPaul said:

If the fexix go that low... :thinking:

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Indeed they do.

LD20
9 lumens
71 hours

An e01 head and a few aa's in paralell in a mint tin would be cheaper..

R@ndom said:

An e01 head and a few aa's in paralell in a mint tin would be cheaper..

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This sounds like a project I could handle. Thanks for the idea. Should run for about a week.

Geoff

Flying Turtle said:

This sounds like a project I could handle. Thanks for the idea. Should run for about a week.

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I'd go with a Proton Pro head on a mint tin, it already runs ~250 hours on 1xAA (500+ hours on red)..

He did ask for around 10 lumen, so I think that rules out the multimode or settable modes that go way below that. But they do get great runtime and saves night vision.

The LD20 might be a good choice for what you want.

Too bad he added the Edit about only 2AA.

If you go with 8AA:
Fenix TK40. 13 lumens (150 hours)

I he wants 10 or near 10 lumens, LD20 might be unbeatable nowadays. If he said 10 lumen trying to say "very low output", then some lights can last longer.

Sandwich Shoppe 2-Cell PR Bulb in a Dorcy Gelbrite.
Can't find the SMJLED at Lighthound.

Flying Turtle said:

This sounds like a project I could handle. Thanks for the idea. Should run for about a week.

Geoff

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thanks for likeing my idea btw there's a e02 head on sale in the marketplace somewhere..

R@ndom said:

thanks for likeing my idea btw there's a e02 head on sale in the marketplace somewhere..

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There is no "E02"

how much is the CMG infinity rated at?

Crenshaw