A couple of years ago I bought a few 17 mm drivers from Int-Outdoors described as “EOSLamp, for 1 or 2 AA”. So far, I’ve used a couple of them to rejuvenate some ‘vintage’ Fenix L1P and L2P hosts. They were advertised as having modes of L/M/H/ Strobe, but so far only of them has displayed a strobe. They always start on low.
I found that the drivers won’t tolerate more than about 2.4 v. They function normally with 2 eneloops, but the modes go wonky with 2 alkies or 2 L91s. I’ve settled on using them with a single L91.
Here’s my question - I’ve installed XP-G2 R5 emitters on Noctigon boards, and I’m getting tailcap readings of .03 A, .35 A. and 1.19 A. (Even a fresh L91 doesn’t seem to want to serve up 1.19 A for very long!)
What am I getting for lumens? Is there a convenient formula that I should be writing in my toolbox lid?
What would my estimated run times be using a single L91?
Tailcap measurements won’t do you much good with a boost driver like these. You won’t know the efficiency of the driver. I would try to measure current at the emitter.
I did just test a single AA boost driver today that is likely similar. 2.1 amps at the tail with a fresh alkaline. .55 amps at the emitter(XPL HI). This is with standard multimeter leads as I couldn’t find the ones I usually use for this.
An L91 is a lithium primary (disposable) AA size. In North America, that would typically be an Energizer Ultimate Lithium. I like them because they’re lighter in weight and have better performance in high drain applications. Fresh ones usually test at about 1.7 volts.
An L92 is the same thing in AAA size.
You can compare them here. Courtesy of HJK on this forum. Shows how awful standard alkaline batteries are for flashlights compared to NiMH rechargables. Energizer ultimate lithium on that list is the same as the L91 mentioned. They are a lithium primary in AA size that compare very well to NiMH at high current draws.
In my opinion… NIMH is much much better. AA Lithium primaries give no warning before they expire. Leave you in the dark. NIMH, at least, flickers for a minute or so and expires slowly