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Thread: New reflector for old LSH

  1. #1
    Flashaholic* Ty_Bower's Avatar
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    Default New reflector for old LSH

    I think I'm going to pull the optic out of my LSH and replace it with a reflector. I already have the head open, so that's no big deal. I have an IMS17, an IMS20, and a McR-18.

    Which should I use? I'm partial to the McR-18, but I thought I read somewhere that it takes a little turning down to get it to fit correctly. If that's the case, I'm not interested.

    Am I going to need to get some o-rings or shims or something to get any of these to fit properly?

  2. #2
    Flashaholic* mosport's Avatar
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    Default Re: New reflector for old LSH

    The IMS 17mm fits without any fuss, it's pretty much a straight replacement for the original optic. The only thing I've noticed is that the ARC bezel opening is slightly wider than the IMS by about 0.5mm so you will get some overlap where it meets the lens.

    But since you're already modding... the McR-18 is a first class reflector and will fit better than the IMS after 5 mins worth of work. Some have used a lathe to reduce height off the wide end, 300-400 grit sandpaper also works well. I took 1.5mm height off my McR-18 by working the reflector in small circles over the sandpaper. There shouldn't be any dust when you're finished since the reflector is held inverted. But in case there is, a can of computer duster will take care of things.

    Derek

  3. #3
    *Flashaholic* greenLED's Avatar
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    Default Re: New reflector for old LSH

    I have nothing to add - mosport said it all, and said it well.

  4. #4
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    Default Re: New reflector for old LSH

    Just yesterday I measured the stock optic and the McR 18, the reflector is 0.59 mm taller.
    RC
    Corrected reflector type.
    RC
    Last edited by Reima; 08-16-2006 at 11:16 AM.
    Ra 140C Prototype, HDS EDC U85, U60, MM 1 Watt Arc P, DD M@g 3D with UXIL Lux III.

  5. #5

    Default Re: New reflector for old LSH

    I like the McR-18 as well, it gives a very nice beam. It's a little longer than the stock optic, but it drops right in and I have not noticed the extra internal length to be a problem with any of my battery packs yet. Give it a try first, you can always take it back out and cut it down later if there's a problem

  6. #6
    *Flashaholic* greenLED's Avatar
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    Default Re: New reflector for old LSH

    Quote Originally Posted by Reima
    Just yesterday I measured the stock optic and the McR 19, the reflector is 0.59 mm taller.
    RC
    Something's not right. The McR18 is 12mm tall and when using it in stock form, the o-ring the LS tail is just barely covered by the body. The McR19 is 20.64mm tall, which means the o-ring in the tail wouldn't engage the body at all.

    An NX-05 or Fraen LP are around 11mm tall, IIRC.

  7. #7
    Flashaholic* Lunal_Tic's Avatar
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    Default Re: New reflector for old LSH

    Here's a thread for you with a little more info: McR-18 vs IMS 17

    -LT
    lunal tic (n)
    a distinctive behavioral trait or quirk directly related to or caused by light [15th cent. Latin lunaris. Ultimately from an IE word meaning “light,”] and [Early 19th cent. Italian ticchio.] see also: moon quirk

  8. #8
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    Default Re: New reflector for old LSH

    Quote Originally Posted by greenLED
    Something's not right. The McR18 is 12mm tall.

    An NX-05 or Fraen LP are around 11mm tall, IIRC.
    With my digital calipers the McR18 measured 12.02mm and the NX-05 measured 11.43mm.
    RC
    Ra 140C Prototype, HDS EDC U85, U60, MM 1 Watt Arc P, DD M@g 3D with UXIL Lux III.

  9. #9
    *Flashaholic* greenLED's Avatar
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    Default Re: New reflector for old LSH

    Reima, your original post says:
    ...I measured the stock optic and the McR 19...
    The source of my confusion has been clarified now.

  10. #10
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    Default Re: New reflector for old LSH

    thanks greenLED, I have correct that now.
    RC
    Ra 140C Prototype, HDS EDC U85, U60, MM 1 Watt Arc P, DD M@g 3D with UXIL Lux III.

  11. #11
    Flashaholic* mosport's Avatar
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    Default Re: New reflector for old LSH

    Should add that I took removed 1.5mm from the McR-18 so that it would fit in a modded ARC LS with FLuPIC drop in. Since this light engine setup is thicker than the original ARC metal core PCB, more material was sanded off to compensate.
    So if replacing an optic with original ARC board, you won't need to take off as much.

    Here's a good thread on shortening McR-18's (started by greenLED) with a response post by Don himself. The original unmodded setup allows 72.49 degrees of reflection, while shortening 1mm yields 75.24 deg (+3.4%)and 78.32 deg (+8% ) at 2mm reduction. I like using McR-18's with a 'joker' LUX for a wider hotspot.

    As Reima measured, the difference in height between McR-18 and NX-05 is only 0.6mm. I'll be modding another McR-18 and will post pics!

  12. #12
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    Default Re: New reflector for old LSH

    mosport, bring on the pics !!

  13. #13
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    Default Re: New reflector for old LSH

    Where do you usually buy MCR-18? The sandwich shop does not have any right now.

    IMS-17 in my ARC LSH Flupic changed its shape ,because of the heat from the emitter. I am using thermal compound though.

    Justone

  14. #14
    Flashaholic* mosport's Avatar
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    Default Re: New reflector for old LSH

    That's where I usually buy McR-18's Justone, looks like Wayne's on vacation till mid-week so perhaps try contacting him for availability.

    Bombel, the pics haven't been taken (yet...)

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    Default Re: New reflector for old LSH

    Ty_Bower, how is the project coming ?

  16. #16
    Flashaholic* Ty_Bower's Avatar
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    Default Re: New reflector for old LSH

    No news to report. I've got the McR-18, and pretty much decided that's the way I'm going to go. I just need to find my calipers and some fine grit sandpaper, and I'm going to take about 0.6 mm off the front of the McR-18. I figure then it'll be a drop in replacement for the Fraen that is in there now. Of course, the Fraen makes a really nice beam too, and that is slowing me down a little.

    In case you were wondering, this is for the LSH that now wears your CR2 pack.

  17. #17
    Flashaholic* mosport's Avatar
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    Default Re: New reflector for old LSH

    Posted instructions and pics on how to shorten a McR-18 here, when modded it'll fit inside an ARC LS nicely!

    HTH,

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