***beamshots*** Eiger level #6 runtime

Did a quick runtime test for the Eiger level #6 SS with a fresh Duracell. At test start, the voltage was 1.61v. The output dropped in an hour, and the battery now was 1.31v. I got useful light for 8 hours when I decided to call it a day. Haven't yet measured the voltage (will update soon). Around 8 hrs., I'd say it was putting out ~8 lumens out front - still very usable. I'd say this level is the best combination of power, and runtime.

EDIT: Post #4 contains beamshots, and other details.

-Amarendra

Re: Eiger level #6 runtime

How bright was it at the start?

Take care,
MK

Re: Eiger level #6 runtime

Recently I did a runtime test with my two Peak Eiger's (#4 and #6). I used a simple light box with a lux meter for measuring the brightness. Both light were equipped with a fully charged Sanyo eneloop AAA.

The regulated output of the Eiger #4 was 20 lm for 3:30 h, the Eiger #6 emitted 41 lm for 1:20 h. After that the output of both lights dropped to 1 lm within an hour. At that point I stopped the test.

When using a single cell the Eiger #4 is the more efficient light.

Re: Eiger level #6 runtime

Finally, I managed to note down the voltage readings, and the output (best guess, since I don't have the equipment). I have the Peak Eiger SS power level #6, XP-G cool white head.

The light was fired up on a fresh Duracell AAA alkaline at 10am, and continued running even at 10am the next day. Here are the voltage readings of the battery:

Voltage -------- Time since power on
----------- ------- ---------------------------
1.64v ----------- 00 hr
1.36v ----------- 01 hr
1.30v ----------- 02 hr 10 mins
1.30v ----------- 03 hr 10 mins
1.24v ----------- 04 hr 15 mins
1.21v ----------- 05 hr 25 mins
1.19v ----------- 08 hr 35 mins
1.13v ----------- 11 hr 35 mins
1.07v ----------- 20 hr 35 mins
1.06v ----------- 24 hr 20 mins

Initially, the output was ~40 lumens. After 24 hrs., the Eiger was giving out ~2 lumens output. It was strong for the first 4 hrs., or so - very usable light. It equalled the output to that of an Arc somewhere around the 6 hr. mark, and around 10 hrs. later it was putting out about ~5 lumens. All the lumen output is approximate, and derived by visual comparison with a similar output light.

The aim of the experiment was to see how long before I require to change the battery. And I am happy to say that the Eiger #6 did meet my specifications of at-least 4 hrs. decent light (I am a Arc AAA-P person, so Eiger was very bright!).

Some photos, along with the timelines attached. Hope someone finds this data useful.

-Amarendra

At 0 hrs (1.64v):


At 3 hr 50 mins (between 1.30v and 1.24v):


At 5 hr 50 mins (between 1.21v and 1.19v):


At 8 hr 55 mins (between 1.19v and 1.13v):


At 21 hr 10 mins (~1.07v):

Re: Eiger level #6 runtime

Thanks for the review. Is that a narrow optic? How do you like the beam?

Re: Eiger level #6 runtime

regulator said:

Thanks for the review. Is that a narrow optic? How do you like the beam?

Click to expand...

Yes. The beam is very even, with a tight spot. In the early days I liked the wide profile, but overtime I have converted to liking tight beams. And you can always convert the narrow to a diffused beam, but not the other way round.

-Amarendra

Re: Eiger level #6 runtime

:thanks: Thanks for your work on this, Amarendra.

Re: Eiger level #6 runtime

whistrot said:

When using a single cell the Eiger #4 is the more efficient light.

Click to expand...

If you view Peak's data sheet, that is most definitely the case. On a 1.5V battery (boost mode), the #4 power and below is ~80% efficient, and the efficiency drops to ~60% on the #6 and ~40% on the #8. These are approximations. The efficiency is much different as the supply voltage reaches 3.0V or greater (buck mode).