First Mod : Arc LS + R3J + LP-Fraen @ 650 mA PICS

This is my first mod, it is a simple-and-dirty mod inspired by other users of this wonderful forum !
I used only a little screwdriver (to remove the Artic-alumina ? ) for take apart my ARC LSHP then i added a LP_Fraen , i desolder the original led ( i think that it was a P3 ) and solder the super white R3J , then i solder another resistance in parallel with the R15 to double the current across the led, reassembled the whole thing and /ubbthreads/images/graemlins/cool.gif my luxmeter measured 980 Lux at 1 meter (more than double the original configuration).
I know that i can have some thermic problem but i use this light only for short time, the current draw is 950mA not to bad since the current draw of the SF-L1 is 900mA.

This is one simple mod but i am really happy with it /ubbthreads/images/graemlins/tongue.gif
Now i can swap the optics ( LP-Fraen , NX-05, MC_Flood ), change the led ( Lux III ? ) and regulate the current in the led , and the ARC-LS is a perfect host .
Thanks to all /ubbthreads/images/graemlins/wink.gif.

scrape,scrape,scrape.....


30 min later ........












and this is MC-L4 BB600 R2H on the left and my mod on the right.

That is exactly what I was looking for to do my Arc, thanks. /ubbthreads/images/graemlins/buttrock.gif What resistor did you use? Will this work with the stock Arc Luxeon?

Very slick, Miciobigio ! /ubbthreads/images/graemlins/thumbsup.gif

BC

Nice! CM is just did an Arc board for me with a Lux III at 667 mA. I'll try both an NX05 and a Fraen in it, see which one suits me better....

Dan C

hmmm... I'm an Arc LS neophyte, but how is the heat sinking on the Arc board? At 650ma will the heat travel away from the emitter fast enough?

Jon

[ QUOTE ]
G Pilot said:
That is exactly what I was looking for to do my Arc, thanks. /ubbthreads/images/graemlins/buttrock.gif What resistor did you use? Will this work with the stock Arc Luxeon?

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I used 2 0.33 ohm resistor in parallel, soldered using the 2 free pads near the R15.
And yes, if you have a good bin in your Arc you do not have to change it.

Ciao

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StoneDog said:
hmmm... I'm an Arc LS neophyte, but how is the heat sinking on the Arc board? At 650ma will the heat travel away from the emitter fast enough?

Jon

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You are right, i think that the problem in this mod will be heat ! For this reason this is a "dirty mod" /ubbthreads/images/graemlins/wink.gif

I like that picture of the light firing statight up--looks like a white flame /ubbthreads/images/graemlins/smile.gif

Heat sinking seems to be okay. Could be better, but the board has the integral sink that goes along the ring and collet that ride along the body.

-Jason

How do you remove the silver retaining ring in pic #2?

Wow, nice mod Micio! But I did not know an Arc's board could put out nearly a full amp by simply altering the resistance...?

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Phaserburn said:
How do you remove the silver retaining ring in pic #2?

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After cleaning the ring and the inside of the head ( scraping off all the silver s**t with a small flat screwdriver ) i used the pliers that you can see in pic 4 to twist the ring.

[ QUOTE ]
MR Bulk said:
Wow, nice mod Micio! But I did not know an Arc's board could put out nearly a full amp by simply altering the resistance...?

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Thanks, but i only copied the mods of others CPF users !
If you half the "sense resistor" R15 you should double the current to the led from 330 to 660 mA circa.
I have not measured the current trough the led but i measured the current draw (of the full flashlight) from my bench power supply and is 950-970 mA circa at 3V.

Ciao

Nice work, indeed...

I also modded my Arc LS (LSL-P) in close fashion, but didn't swap out the LED - may have to do that next. I was fortunate to receive a lot of help from the postings and replies of Flash and CM when it came to modding the stock 0.15 ohm resistor. I simply stacked three low-value resistors (1.0 ohms) on top of the existing R15 - at best, I should be pushing close to or just below 500mA.

Hmmmmm... perhaps I should've hit up Mr. Bulk for a Fraen optic for a little more modding on that Arc.... although, I suspect I would have to have a high dome LED to make proper use of the Fraen. /ubbthreads/images/graemlins/thinking.gif

In regards to the retaining ring, however, like Flash and others, my Arc had the Loc-tite adhesive as opposed to the AA - so a Dremel tool was the only way to get that little bugger out of there! A local hardware store was able to cough up a matching retention ring.

Thanks for posting the photos Marco... if you ever consider swapping out the Lexan lens of the Arc, Chris from Flashlightlens.com has the size already for a Schott B270 glass lens.

-Jim

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PieThatCorner said:
Nice work, indeed...


... CUT ....

In regards to the retaining ring, however, like Flash and others, my Arc had the Loc-tite adhesive as opposed to the AA - so a Dremel tool was the only way to get that little bugger out of there! A local hardware store was able to cough up a matching retention ring.

Thanks for posting the photos Marco... if you ever consider swapping out the Lexan lens of the Arc, Chris from Flashlightlens.com has the size already for a Schott B270 glass lens.

-Jim

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Thanks Jim,

my ARC LSHP had no loctite inside , i was lucky.
Thanks for your information on the Lexan lens ,
i never known that Flashlightlens.com has the
right size replacement !!! this is a usefull
information, thanks.

The arc circuit can supply a pretty good amount of power to the led. CM did a mod for me. Its an arc lshs with fraen lp, R2K and 1000mA /ubbthreads/images/graemlins/ooo.gif /ubbthreads/images/graemlins/tongue.gif Heat isn't all that much of a problem, and i find myself frequently using a twisty pack... at least until i get some more high capacity nimh AA...