P91 with 2x RCR123A

Fuchshp

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Good Morning

I'd like to use 9V bulbs in a Surefire 6Z and power it with 2x RCR123A.


6Z_640_zpsgt1urc6q.jpg


Neither Surefire P91 nor Solarforce 9V turns on. The bulbs are ok with CR123A's. Do you have an idea why? Could it be the protection circuit of the batteries?
 

fivemega

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If your batteries are protected, then it could be protection problem.
P91 pulls about 2.4 Amps and you need to use pair of IMR16340.
 

Fuchshp

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Ok, thank you. I bought two of these.

$_12.JPG


N Fetterly, your name sounds very Swiss. Your anchestors probably emigrated from Switzerland.
 

Kestrel

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I just gotta say, a "Laser Products Switzerland" 6Z, very cool. I have seen a few "Germany"-engraved tailcaps posted but have never seen one of these before. :thumbsup:
 
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archimedes

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Wow ... I would think a 6Z-CH should qualify for the @DaFABRICATA @Rat "Rare Surefire thread" !
 
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scout24

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Now I need to try a P91 with two IMR 18350's...

Edit- Works nice in my stealth Oveready black HAIII 6P. For some reason I thought the P90 was safe on two IMR's, but the P91 was not good for the bulb. Maybe the smaller cells are ok? Either way, nice and white for sure. Whiter than on three primaries. Looking forward to the last dog walk tonight after dark to see how it looks outdoors! :)
 
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fivemega

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For some reason I thought the P90 was safe on two IMR's, but the P91 was not good for the bulb. Maybe the smaller cells are ok?
That's true.
Smaller cells like 16340, 18350 and 14500 will drop voltage under heavy load therefore total voltage of 2 cells will be close to healthy operation of P91
Using larger cells like pair of 18650 or 26650 cells will put too much stress to bulb and tend to instaflash it.
If lower brightness of P90 and larger cells like pair of 26650 is OK for you, this combination will work for very long time per charge and excellent performance.
 

scout24

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Thanks for the explaination, Fivemega. The P90 on 2x18650 is a favorite of mine, great color temp and runtime. P91 is an entirely different animal though, even if runs are short on 2x18350's. Very impressive for a stock bulb. :grin2:
 

nfetterly

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Looking forward to the last dog walk tonight after dark to see how it looks outdoors! :)

Unfortunately my mixed breed 55lb "Bernese Mountain" looking dog is 14.5 years old and doesn't do well on walks any more. Still a loveable dog in great humour that likes to keep my youngest (24 yr old) daughter up playing at 1 am. Not so many walks any more. Need to keep off CPF while drinking - need to stay away from custom B/S/T tonight for sure!

The P91 with 2 imrs (in 6P) rocks - wonder it I should try it in my TNC 2x26650 light with the AW soft start 3 level switch, it's got 14 trits on it, perfect for dog walking. Sounds like a plan for after I get my taxes finished up this weekend. I'll let you know how it goes !! Also I'll stay away from the MNKE 26650s, they DID NOT impress me. I had a high output Mac's triple triple that was "okay" on the MNKE IMRs, but on 36650s was a whole different world. And talking shut it down, change batteries and "holy crap is that the same light" different world.

Early day tomorrow, new equipment startup in a pulp & paper mill.
 

scout24

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My "Big Dog" (130lb. Central Asian Shepard) makes it through the night after walking at 7:30-8:00, our little guy (Chihuahua) wants one last trip out at 10pm or so. I'm actually glad, since it's well dark by then all year. Looking forward to summer nights this year, as we didn't have him last summer. It's certainly tough as they get older...
 

scout24

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Bump... I am sorry I missed the P91/ 2 small IMR's earlier in my time here. As nice as the free lumens of the P90 on rechargables is, I have a new favorite Incan setup in that P91. 12 minutes timed on a pair of 18350's brings the cells down to 3.9v, still well above empty. Output is a bit down at that point, but such a sweet beam! I trolled for a few backup P91's in and amongst the recent antique light kick I've been on, so I've got a few spares. Thanks for the setup info, folks!!! :)
 

recDNA

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I used my P91 for years with 2 x 18500 and ironically it blew shortly after I switched to 3 x CR123A. It was originally in a 9P I sold then in a Solarforce with extension. It's amazing how long it lasted. Sheer luck. Used to be able to buy those bulbs at a lot of brick and mortar stores. No more.
 

Timothybil

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Check out Lumens Factory. They still make a lot of D26 lamp assemblies, in four volt for a single Li-Ion, six volt for two primaries, and nine volt for three primaries or two Li-Ion cells. I swapped their HO6 for the P60 in my first G2 and was really pleased with the results. One hundred eighty lumens instead of sixty five, and still a fifty minute run time. Since then I have purchased several of their LED lamp assemblies and have had nothing but good results from all their lamps.
 

fivemega

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One hundred eighty lumens instead of sixty five,
If you mean HO6 has 3 times lumens of P60, you are wrong.
Take a close look at here:
http://www.lumensfactory.com/specification01.php
and here:
http://www.candlepowerforums.com/vb...urrent-draw-SF-amp-other-brands-incl-hotwires
As you see,
LF Xenon HO-6 (5 Volts, 1.4 Amps=7 Watts) with 20 hours of life (rated at 160 Lumens)
Vs
SF Xenon P60 (5 Volts, 1.13 Amps=5.65 Watts) with 30 hours of life (rated at 65 Lumens)
How do you explain it?
LF is rated at beginning of fresh cells.
SF is rated in average of one hour cells life.
LF is an excellent bulb but can not compare their rating with SF rating.
 

novice

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Fivemega,
You have previously stated in other posts that
(and I'm paraphrasing and editing, which is why I am not doing a quotation. Please correct me if I'm wrong.):

2xAW18650 protected cells will work for the MN15 & MN20 9 volt lamps .
2xAW18650 protected cells will overdrive the MN16 & MN21 9 volt lamps.
3xAW18650 protected cells will overdrive the MN60 12 volt lamps.
3xAW18650 protected cells will severely overdrive the MN61 12 volt lamps.

Will AW IMR 26650 cells overdrive the above-mentioned lamps even more?
 

Swedpat

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Fivemega,

I like P90 and and have been using it in my bored 9P with 2x18500 and it has worked good so far. Therefore I thought it should be a good idea to run P91 with 2x18650 to get some decent runtime. But then I read in another thread that you tell 2x protected 18650 will severely overdrive it.

1: Should I avoid even P90 with 2x18650?

2: Is it better to run P91 with 2xprotected 18500 than 2x18650?

3: Is there any other high brightness bulb(brighter than P90) suitable for 9P with extender and 2x18650?

Patric
 
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