Original L1P circuit info.???

Robocop

Mammoth Killer
Joined
Nov 13, 2003
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2,662
Location
Birmingham Al.
I was playing around with some of my hybrid rechargeable cells tonight and had a few that I was trying to run down in order to cycle them to full capacity. I used one of my original Fenix L1Ps along with my cheap little RiverRock 1-AA one watt luxeon bought from Target.

I noticed that the RR gave out quickly so I checked the voltage and it was right at .93 and would not fire back up at all. I swapped out the battery and the drained cell worked pretty good in the old Fenix. I guess there is more to looks when buying a cheap light as the Fenix circuit seemed to be much better than the RR as it did work when the same battery would not power the RR brand.

Point of this whole story is what major component on a circuit board determines the circuits ability to light up at a low voltage where other circuits fail? If I remember correct the early Fenix L1Ps were geared more towards the cheap rechargeable cells and actually did better on the cheap cells than they did with alkalines. I do not know tech stuff however 2 lights of pretty equal output and size but very different behavior with depleted cells is interesting to me.....what actual part or design makes the Fenix light with almost no voltage ?

If it is something simple I am thinking of trying to improve on some of the lesser performing circuits I have....you know like a simple swap of a part on the circuit board but something tells me this will not be the case at all.
 
One of my daughters has my original L1P, and it does run, and run, and run. I recently purchased the new L1P using same S bin Lux I as original. Not sure about difference in circuit except for the two stage twisty switch of newer L!P. I think all L1Ps use a simple DC/DC circuit and do not truly regulate at 1.2+ volts. I may be wrong. I will try to google search-cpf only.

Bill

Will I was wrong. The original L1P used an R bin Lux I. There is no new L1P, it has been discontinued, and the L1S has taken its place. The L1S runs in perfect regulation in low mode, and looks more like DD in high mode. See chevrofreak's runtime graphs.

Bil
 
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I have two of these and have swapped the emitter in one of them to a TXOH or maybe even a J bin luxeon but cant remember....they both were bought over a year past so they are the older versions that have been discontinued.

I was really amazed at the lights ability to light up fairly well on .93 Volts and it got me searching old threads. I found little information however do appreciate the runtime graph link.....seems like these older versions were famous for their ability to use the cheap rechargeable cells and do very well with them.
 
Definitely makes me want to hang onto my Fenix L1P. Still a virgin without a single scratch, either :)
 
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