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Thread: UCL Lens for Arc 4+

  1. #1
    Flashaholic neo_xeno's Avatar
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    Default UCL Lens for Arc 4+

    hi guys, i was wondering if anybody has the UCL or the UCL-LDF lens for their Arc 4+ from flashlightlens.com? How much of a difference do they actually make?

  2. #2
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    Default Re: UCL Lens for Arc 4+

    [ QUOTE ]
    neo_xeno said:
    hi guys, i was wondering if anybody has the UCL or the UCL-LDF lens for their Arc 4+ from flashlightlens.com? How much of a difference do they actually make?

    [/ QUOTE ]
    A post stated 12% increase with the UCL.

  3. #3

    Default Re: UCL Lens for Arc 4+

    Much better with glass

  4. #4
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    Default Re: UCL Lens for Arc 4+

    I just asked my older son: What do you think a glass lens with 99% transmittance looks like.
    He answered correctly: You just can't see it.
    I like it.
    The UCL-LDF widens the beam nicely if you need that.

    I just wanted to start a thread that I found the perfect tool (for me) to change the lens:
    It is a tool for opening watches und it is easy to adjust:



    For people in old Europe: it is Conrad's #800017

  5. #5
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    Default Re: UCL Lens for Arc 4+

    I bought the UCL lens for the Arc 4+ and I can't say I can tell a difference in brightness, but the lens looks good, is much, much easier to clean, and much more scratch resistant

    The tool I used to change the lens was a snap ring tool I bought at my local tool store and it works perfectly.

  6. #6
    *Flashaholic* this_is_nascar's Avatar
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    Default Re: UCL Lens for Arc 4+

    [ QUOTE ]
    PeLu said:
    I just asked my older son: What do you think a glass lens with 99% transmittance looks like.
    He answered correctly: You just can't see it.
    I like it.
    The UCL-LDF widens the beam nicely if you need that.

    I just wanted to start a thread that I found the perfect tool (for me) to change the lens:
    It is a tool for opening watches und it is easy to adjust:



    For people in old Europe: it is Conrad's #800017

    [/ QUOTE ]

    I purchased this same tool a couple months ago, but haven't tried it yet. Did you have to heat the bezel before taking the ring off?

  7. #7
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    Default Re: UCL Lens for Arc 4+

    When I changed the lens in my Arc 4+, the threaded ring that retains the lens wasn't very tight and unthreaded easily.

  8. #8
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    Default Re: UCL Lens for Arc 4+

    [ QUOTE ]
    this_is_nascar said:
    [ QUOTE ]
    PeLu said:
    I just asked my older son: What do you think a glass lens with 99% transmittance looks like.
    He answered correctly: You just can't see it.
    I like it.
    The UCL-LDF widens the beam nicely if you need that.

    I just wanted to start a thread that I found the perfect tool (for me) to change the lens:
    It is a tool for opening watches und it is easy to adjust:



    For people in old Europe: it is Conrad's #800017

    [/ QUOTE ]

    I purchased this same tool a couple months ago, but haven't tried it yet. Did you have to heat the bezel before taking the ring off?

    [/ QUOTE ]
    I have that wrench and mine was tight. I burred the two slots I used. Somebody suggested that they filled the smallest pins to give a radius to fit better, whish I would have done that.

    I'm getting another bezel nut with my Rev2Arc4+

  9. #9
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    Default Re: UCL Lens for Arc 4+

    I didn't heat mine and it came off very easily. I used an automotive screw type lock ring removal tool using the smallest pins. fits perfect, note the groves in arc retaining ring are oval.

    I noticed a huge diffence on level 16. for some reason the eye noticed the increase.

  10. #10
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    Default Re: UCL Lens for Arc 4+

    Although it's not a very apparent increase to my eyes, I replaced two ARC 4+ lens with UCL's and got 19-20% increase according to my light meter. [img]/ubbthreads/images/graemlins/grinser2.gif[/img]

  11. #11
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    Default Re: UCL Lens for Arc 4+

    Just curious... replace any lens on ARC4 will void warranty?

  12. #12
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    Default Re: UCL Lens for Arc 4+

    [ QUOTE ]
    this_is_nascar said:
    I purchased this same tool a couple months ago, but haven't tried it yet. Did you have to heat the bezel before taking the ring off?

    [/ QUOTE ]
    Absolutely not. It worked easier than expected. I tried it first with lockring pliers and I was not able to do it at the first few tries, so left it until I got this tool yesterday.

  13. #13
    Flashaholic* Likebright's Avatar
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    Default Re: UCL Lens for Arc 4+

    Yep,

    UCL = Brighter, better and won't scratch as easy.
    I have no use for the LDF lens.
    Mike [img]/ubbthreads/images/graemlins/grin.gif[/img]

  14. #14
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    Default Re: UCL Lens for Arc 4+

    When comparing the original lens with the UCL lens, you should specify whether the former still had the lens protector in situ. I was convinced that removing this little plastic film resulted in a small but noticeable increase in brightness. I have recently bought the UCL lens as well, but I haven't had any luck removing the retaining ring on my 4+ yet. I don't think I could justify buying special tools for this one operation even if I had any idea where to find them. Is there a way to remove the ring without special tools?

    Stathis

  15. #15

    Default Re: UCL Lens for Arc 4+

    Since I have a Rev 2 on order, couple questions then:

    1) Has anyone done a dunk test on this? I'm very concerned because, if I remember correctly, the UCL is not the same thickness. The Waterproofing, to me, on the Arc 4 is one of the major selling points. I won't trade brightness for waterproofness. EVER.

    2) Stemming off the space issue: Is there need for a Gasket? Or an O-ring? The UCL is glass after all..

    3) Pics of and Arc with the UCL in it?

    Brian

  16. #16

    Default Re: UCL Lens for Arc 4+

    I have a first and a second Arc4+. I bought some lenses about two months ago for them from flashlightlens.com I bought a UCL and a UCL LDF and I only just changed them out with the watch bezel remover. I don't know if the lenses that he sells now are the same or not. I believe they are.

    I scavenged the o rings from the head of a maglight aa and used them below the bezel nut to protect the lense and fill the space. Without the oring the ucl w/o ldf (it went into the first) rattled so I was positive that it wouldn't have been waterproof. It was a little bit tricky putting the oring into the first because it wants to roll up a little. I just did it slowly and paid attention and managed to get the lense and oring in snug without any rattle. Next, I did the blow test by removing the head and blowing first through the top and then through the bottom, it passed. Next, I filled a class of water, checked to insure that the other joints were snug , turned the light on level 4 and kerplunk- dropped my 180.00 light into the water. I watched it for about 30 seconds and had no rising bubbles from the bezel and (it went in switch end first so that the bezel was facing up) I noticed no water entering either. The Arc4 was removed and I looked closely at the lense and bezel area (I didn't go so far as to disassemble it) and saw nothing that would indicate that the waterproofing had been compromised.

    Let me say also that I was really surprised when I saw the thickness of the original lense. It really is a beefy chunk of lexan. I have pocket clip carried my arc 4 since I got it (about 3 weeks after they started shipping) and I work as an electrician so the film had gotten scratched and cruddy and it had slight bubbles under it to begin with which affected the beam so I removed it and started fresh with a nice clean suface (The beam is better without the film even when the lexan isn't scratched). Within 6 weeks I'd scratched up the lexan pretty good to the point where it affected the beam and so thats when I changed it to the ucl. The difference between ucl and scratched lexan is amazing. The beam is clearly brighter and cleaner. Not to mention that when I look at the reflector end of the light it is an obvious improvement. I also know that in six weeks it will still be clear. It isn't maintenance free. I feel that it is important to pull the bezel nut every few months or so to look for chips around the outside of the lense just to make sure it is still waterproof. Because of this I'll buy another lense or two to have on deck.

    Sorry no pics but it looks much better.

  17. #17
    *Flashaholic* this_is_nascar's Avatar
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    Default Re: UCL Lens for Arc 4+

    I'm still skeptical concerning the durability of the UCL. I know that I can throw my Arc4+ against the wall and the Lexan won't break. I'm not sure I can say tha about the UCL.

  18. #18
    *Flashaholic* Rothrandir's Avatar
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    Default Re: UCL Lens for Arc 4+

    the ucl's should be quite durable. they're thick and they're small. but of course they won't be as durable as the lexan lenses.

    if your criteria is better output and scratch resistance, than you want ucl.

    if your main concern is durability, then you want lexan.

  19. #19
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    Default Re: UCL Lens for Arc 4+

    What exactly is the difference between the UCL and the UCL LDF lens? I know that the UCL has a MgF2 anti-reflective coating on both sides and that the UCL-LDF has a Lexan diffusion film applied to one side, but what difference does that make?

  20. #20
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    Default Re: UCL Lens for Arc 4+

    LDF makes the beam more flooded instead of having a hot spot in the middle

  21. #21
    *Flashaholic* this_is_nascar's Avatar
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    Default Re: UCL Lens for Arc 4+

    Using the UCL lens, does it matter which way it goes on? Which side goes closest to the LED or doesn't it matter?

  22. #22

    Default Re: UCL Lens for Arc 4+

    I'm not sure if it matters. It seemed to me that one side appeared more reflective than the other and I put that side facing away from the led cuz that just seems to make sense.

  23. #23
    Flashaholic* Sean's Avatar
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    Default Re: UCL Lens for Arc 4+

    Will the E2e pyrex lens fit? I thought someone said it would but I can't remeber for sure.

  24. #24
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    Default Re: UCL Lens for Arc 4+

    anti-reflective coating is applied to both sides, so it shouldn't matter much

  25. #25
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    Default Re: UCL Lens for Arc 4+

    [ QUOTE ]
    this_is_nascar said:
    I'm still skeptical concerning the durability of the UCL.

    [/ QUOTE ]

    I'm shure, when the first UCL lens breaks we will hear about it in here.
    And there should be several Arc4s around with it....

  26. #26
    Flashaholic* Klaus's Avatar
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    Default Re: UCL Lens for Arc 4+

    The SF Pyrex DOES fit nicely but is a tad thicker and the retaining nut will show a little, the UCL is a little bit thinner and does fit perfectly, it might be even a little bit brighter with the AR coating on both sides versus the SFs one sided AR - don´t nail me on that statement though.

    Klaus

  27. #27
    Flashaholic flashlightlens's Avatar
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    Default Re: UCL Lens for Arc 4+

    I have an individual who has access to a bunch of donor heads running a series of tests to verify the durability of the UCL in the Arc4. So far, tests have damaged the head to the point of not being able to remove the retaining ring with no damage to the lens. I have not heard of any reports of a lens chipping from the retaining ring either. So far, it's turning out to be very durable.

    One mention was also made of an intersting EDC note. The glass lens apparently seems like it doesn't collect as much dust as the polycarb. This may have something to do with static?

  28. #28
    Flashaholic flashlightlens's Avatar
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    Default Re: UCL Lens for Arc 4+

    [ QUOTE ]
    this_is_nascar said:
    I'm still skeptical concerning the durability of the UCL. I know that I can throw my Arc4+ against the wall and the Lexan won't break. I'm not sure I can say tha about the UCL.

    [/ QUOTE ]

    If you or anyone else would be willing to test this, I'll send you two free lenses - regardless of if the lens breaks. Of course, I won't send you a new Arc....

  29. #29

    Default Re: UCL Lens for Arc 4+


    Flashlightlens:

    Have you found a Gasket or O-ring that you can use with the UCL? The waterproofness of the thinner UCL frightens me to no end. This is why I have yet to purchase one..

    Brian

  30. #30
    Flashaholic flashlightlens's Avatar
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    Default Re: UCL Lens for Arc 4+

    The UCL we stock for the Arc4 is a full 2mm thick, which is only about .5mm thinner than stock. It utilizes the stock o-ring just as the stock lens does. In theory, there should be no change in the water resistant of this setup vs stock. The fear was that you couldn't tighten the ring down as tight with the glass in order to make a seal without chipping the lens. So far, this has only been a fear - I haven't heard any reports of lens damage yet.

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