AFAustin
Flashlight Enthusiast
In another thread: http://www.candlepowerforums.com/vb/showthread.php?323453-How-to-Tell-Eiger-Emitter ,archimedes persuaded me to do a little runtime testing, to compare an original Eiger Rebel #4 with an Eiger Rebel #8 with a "bare" QTC square installed in the tail so that it could be "dialed down" to approx. #4 level. He believed that the QTC light would be significantly more efficient than the non-QTC light in that the QTC converts almost no current to heat, unlike the resistor in a non-QTC light. I did 2 different tests, both of which were crude and run hastily, and without close monitoring of the lights, but with those caveats, here's what I got.
In the first test, I installed a freshly charged Duraloop LSD NiMH cell in each light, and dialed down the #8/QTC to approximate the total output of the #4. This was measured just by my eyeballs doing a ceiling bounce test in a dark closet.
As I said, I wasn't monitoring the lights closely (doing too many other things at the time!), and should have, but didn't, record when they first fell out of regulation and began to dim. (From memory, though, I believe the #4 is steady for about 4 hrs.) At about 5 hrs., though, I did see that each had lost roughly 1/3 of original output. But then things got interesting. At a little under 6 hrs., the #4 was now very dim (almost gone), but the #8/QTC still had a very useable output, maybe 1/2 of the original. I checked the cells at this point on my DMM. The #4 was at 1.13v and 3.1 mA. The #8/QTC was at 1.25v and 3.5 mA. Go QTC!
The #4 was played out, but I decided to keep going with the #8/QTC. But, I now cranked it up so that its output matched the #4's with a fresh cell (initial output). I then monitored the #8/QTC more closely, and continued to dial up the level as needed to keep matching the #4 original output level. By the time I had it cranked up all the way (it faded pretty quickly after that), the #8/QTC had run a tad more than 2 additional hrs. Very good results for the #8/QTC, I'd say.
I did a second test as well. This time I tested only the #8/QTC. Once again, I dialed it down to match the initial output from the #4. This time I wanted to see how long, with tweaking as needed to maintain steady output, it could maintain the initial #4 level. Again, my recollection is that the #4 can do about 4 hrs. of regulated output with little dimming.
The result was right at 6 hrs. That is, the #8/QTC, dialed down to match original #4 output, maintained it for 6 hrs., while the #4 can manage 4 hrs. Again, very nice results for the QTC set-up.
Not exactly strict science here, but I hope this is useful.
Andrew
UPDATE (and oops) : Please see my post #7 below....looks like the #8 Eiger is most likely an XP-G rather than a Rebel. Needless to say, this changes things quite a bit....Mea culpa. :ohgeez:
In the first test, I installed a freshly charged Duraloop LSD NiMH cell in each light, and dialed down the #8/QTC to approximate the total output of the #4. This was measured just by my eyeballs doing a ceiling bounce test in a dark closet.
As I said, I wasn't monitoring the lights closely (doing too many other things at the time!), and should have, but didn't, record when they first fell out of regulation and began to dim. (From memory, though, I believe the #4 is steady for about 4 hrs.) At about 5 hrs., though, I did see that each had lost roughly 1/3 of original output. But then things got interesting. At a little under 6 hrs., the #4 was now very dim (almost gone), but the #8/QTC still had a very useable output, maybe 1/2 of the original. I checked the cells at this point on my DMM. The #4 was at 1.13v and 3.1 mA. The #8/QTC was at 1.25v and 3.5 mA. Go QTC!
The #4 was played out, but I decided to keep going with the #8/QTC. But, I now cranked it up so that its output matched the #4's with a fresh cell (initial output). I then monitored the #8/QTC more closely, and continued to dial up the level as needed to keep matching the #4 original output level. By the time I had it cranked up all the way (it faded pretty quickly after that), the #8/QTC had run a tad more than 2 additional hrs. Very good results for the #8/QTC, I'd say.
I did a second test as well. This time I tested only the #8/QTC. Once again, I dialed it down to match the initial output from the #4. This time I wanted to see how long, with tweaking as needed to maintain steady output, it could maintain the initial #4 level. Again, my recollection is that the #4 can do about 4 hrs. of regulated output with little dimming.
The result was right at 6 hrs. That is, the #8/QTC, dialed down to match original #4 output, maintained it for 6 hrs., while the #4 can manage 4 hrs. Again, very nice results for the QTC set-up.
Not exactly strict science here, but I hope this is useful.
Andrew
UPDATE (and oops) : Please see my post #7 below....looks like the #8 Eiger is most likely an XP-G rather than a Rebel. Needless to say, this changes things quite a bit....Mea culpa. :ohgeez:
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