Fenix LD11 Single AA Light Performance Run Time Graphs

I recently received a Fenix LD11 light and after doing some run time tests, I thought it would be good to compare to other similar lights.......and with different battery types.



The first graph is a run time at the high mode of a few single AA lights that I have that have been very efficient. Each test was a freshly charged 2000mAh Eneloop battery. I measure efficiency as the area under the curve which is the product of average output x time. Thus a light that doesn't have as high of an output should have a longer run time if it has the same efficiency (area under the curve).

Of note here is that the non XP-E, XP-E2 lights (XP-G2 or XM-L2) are clearly more efficient at the higher driven level. That is the number one reason I have never bought any of the Fenix 2xAA lights based on the XP-E2. If you're going to have the power of two AA batteries, why not at least use an XP-G2.......but I digress.

High mode - in order of efficiency:

Light / Lux / Time / Product / Est Lumens / Mfg Stated Lumens

1) Nitecore MT10A (XM-L2) / 6750 / 147 / 992250 / 120 / 95

2) Eagletac D25A Clicky (XP-G2) / 6200 / 156 / 967200 / 111 / 127

3) Nitecore MT10A, turbo (XM-L2) / 7850 / 120 / 942000 / 209 to 140 step down

4) Fenix LD12 Mod XP-G2 / 7400 / 101 / 747400 / 132

5) Jetbeam PA10 (XM-L) / 8800 / 84 / 739200 / 157 / 140

6) Fenix LD11, (XP-G2) / 8140 / 86 / 700040 / 145 / 130

7) Fenix LD15, (XP-G, R4) / 5550 / 121 / 671550 / 99 / 117

8) Fenix E11, (XP-E) / 7870 / 78 / 613860 / 140 / 105

9) Fenix E12, (XP-E2) / 8500 / 62 / 527000 / 152 / 130



This next graph is a run time at the medium mode using a 2000mAh Eneloop battery.

Medium mode - in order of best efficiency:

Lux Time Product Est Lumens Mfg Stated Lumens

1) Fenix LD11 (XP-G2) 3190 386 1231340 57 50

2) ET D25A Mini (XP-G2) 2910 402 1169820 52 44

3) Fenix E12 (XP-E2) 3790 294 1046640 68 50

4) Nitecore MT10A (XM-L2) 3000 315 945000 54 48

5) Fenix LD09 (XP-E2) 3570 250 892500 64 55

6) Fenix LD12 (XP-G) 3400 239 812600 61 60

7) Fenix LD12 (XP-G2) After 3 units that had all kinds of noise and bad efficiency on the lower modes, I gave up on the LD12 XP-G2



Since the LD11 will run on a 14500, I thought I'd show the results compared against the different battery types......800mA 14500, a 2000mAh Eneloop, a Duracell Alkaline and an L91 Energizer Lithium.

Lux Time Product Est Lumens Mfg Stated Lumens

1) Fenix LD11 (XP-G2) 3220 710 2286200 57 50
(L1 Lithium)

2) Fenix E12 (XP-E2) 3390 568 1925520 61 50

3) Fenix LD11 (XP-G2) 3190 386 1231340 57 50
(Eneloop)

4) Fenix E12 (XP-E2) 3790 294 1114260 68 50
(Eneloop)

5) Fenix LD11 (XP-G2) 3090 297 917730 55 50
(Alkaline)

6) Fenix E12 (XP-E2) 3760 235 883600 68 50
(Alkaline)

7) Fenix LD11 (XP-G2) 3490 247 862030 62 50
(14500)



The surprise for me was how long the LD11 ran at medium mode (about 57 lumens for 12 hours) on an L91 primary lithium battery......and also the E12 ran for 568 minutes.

On this final graph, I'm showing the LD11 on high mode with the various battery types. What is revealing is how well the 14500 does compared to the other battery types at the higher driven current levels. At the medium mode, the Eneloop does the best. The alkaline batteries do a horrible job at these higher current levels. The L91 lithium primary was even a little disappointing but excelled at the medium mode. Conclusion would be that if you're going to be driving the light with a single AA battery at a high current level, the rechargeables do the best.

Love this stuff!

With well-regulated flashlights such as the ones in your test, the "efficiency" you calculate as the area beneath the runtime curve is useful. The runtimes are mostly flat, with a big step-down at the end. In practice, you won't be changing the battery until you hit the step-down.

When a runtime curve has the sloping look of a direct-drive flashlight, then I find the "efficiency" statistic to be less useful. With those flashlights, I will be changing batteries long before I get the efficiency that requires running a battery all the way down.

Thanks hiuintahs for your effort do these runtime graphs, very valuable! :thumbsup:

Nice Hiuintahs! So you think the LD11 will dethrone the E12 as one of your PERSONAL go to lights? I know for gifting E12 is much more economical.

gurdygurds said:

Nice Hiuintahs! So you think the LD11 will dethrone as one of your PERSONAL go to lights? I know for gifting E12 is much more economical.

Click to expand...

Ahhhh, yes I'm afraid so :thumbsup:. I actually like it. The E12 is nice for the price, but the options of battery on the LD11 would dethrone my E12. I was shocked at how long the L91 ran on the LD11 at medium mode so I'm currently doing a test with the E12. It still has many hours to go and I'll update the graph above..........showdown between E12 and LD11 with same battery and approximately the same output........which will win? At 60 lumens, the XP-E2 and XP-G2 have about the same lumens per watt so will be interesting to find out.

Edit:
Updated the chart with the E12 at medium mode using an L91 lithium primary battery. Run time was 568 minutes..........not quite as good as the LD11 but still very respectful.

This is awesome! Since I received the LD11, it's been in my pocket more consistently than any other flashlight I own. I've been running the AW 14500 750mAh in mine.

I also really like the E12. I carry it once in a while when I don't want something quite as "beefy" as the LD11.

I really appreciate this post!