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  1. #1
    Cyclologist Plutonix's Avatar
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    Ultrafire 501B Taillight mount - version 28c

    Slimagainsoon's mounting idea here had a lot of merit but after looking around I think you have to luck into finding something like that fishing mount. But some of the concepts were great and stuck in my mind.

    Lots has been written about there, but for those who werent paying attention, here are some beamshots from 7yds away in the dark. Top is the Ultrafire sitting on the seat, middle is a 9 LED blinkie, bottom is a SF on steady. One shot is directly behind, the other is off to the side a bit to reduce flaring. The 9LED is more "orange" than I thought, but it always runs in a blink mode.



    My approach was to fashion a plastic 'plate' for the inside base of the bag and cinch some zip ties thru it to a modified TwoFish on the outside to hold the light.

    I used a legit TwoFish FLashlight mount as opposed to the DX conterfeit. The fake one uses 2 slots and is a bit smaller. Since a strap as well as 2 zips need to go thru the strap slot, the larger mount allowed more working room. The modification is simply to cut most of the arms off one side so it sits closer to the bag. A dremel seems to work better to make single, even cuts vs even a sharp knife. What remains is a very slight arc on the underside.

    For the base plate, I used a piece cut from an 4xD Cell holder. I put 2 holes directly under where the TwoFish would sit thru the bag and base plate and zipped them tight. This was mainly to hold the plate to the bag for drilling the main holes, make sure everthing lines up the first time and eliminate extra holes. The zip could be removed later but the lock sits under the small arc remaining in the TwoFish so I left it.

    Two pair of main holes are drilled close to the mount and at the front and back edges of the strap slot. This allows the zips to use the edge of the slot leaving room for the strap.



    Some may be able to use the original long LockBlock strap thru the slot, around the light and then around the bag back to the mount somewhat like they are intended. If the zips should fail, the strap should hold onto the light and mount at least for a while. This was not my intention and my bag is too large that close to the mouth, anyway. I just used a short strap from a DX/KD fake to hold the light on the mount and a longer strap all the way around the bag and light combo closer to the tail. This might help a little if it comes out of the TwoFish, but mainly it does pull up on the tail of the light to focus it.



    The UltraFire comes with a real sissy lanyard, so I threaded the seatpost straps of the bag thru the lanyard loop. It is not much but it might hold long enough for me to notice an escape attempt should the zips break.

    HTH
    Man does not live by one bike alone.
    2010 Trek 4500
    2011 Trek 7.5 FX

  2. #2
    Senior Member SlimAgainSoon's Avatar
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    Nice rig!

    And thanks for the shots of the lights. Looks like the Ultrafire does a good job.

  3. #3
    Cyclologist Plutonix's Avatar
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    Thanks!

    I have sort of assumed that the UF washes out the w the LED blinkie when mounted just under it on the bag (which is why I set it on the seat for the pics). However, if set to one of the full flash modes (vs twinkling) it might emulate something like the hi-lo flash pattern of the venerable 140R. If I remember, I'll check tonight.

    I stumbled across 2 optics to diffuse the Ultrafire to a wider beam (ranging from 180 degrees to simply very wide). They are made by a company in Finland but dont seem to have any US distributors. I am going to order some of these and see if they can be made to work (they are ~1mm too small, but only $3).
    Man does not live by one bike alone.
    2010 Trek 4500
    2011 Trek 7.5 FX

  4. #4
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    This makes a great front flasher for the day time when it's overcast or hazy. It will be even better when it gets the new Cree emiter. http://dealextreme.com/details.dx/sku.16241

  5. #5
    Senior Member SlimAgainSoon's Avatar
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    Somebody on here made a diffuser by gluing on an empty glass spice jar of some kind.

    Seemed to work well, in the photos, anyway.

  6. #6
    Cyclologist Plutonix's Avatar
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    Those 501 and 502 bodies seem great - as far as I can tell the only real difference is the clip. If you look around a bit, you can even find them without the assault crowns which bug me a little. They will also take this variable output drop in which (if it works) should let you select the perfect output level. ALl in all, I like my Trustfire 801 better for a helmet light though because it is about half the weight.

    I'd rather not go ghetto on a diffuser, it was just something I stumbled across and thought it might make it more appropriate as a taillight. More side visibility, less light shot upward and at the road:


    I think someone, somewhere ought to have a simple 26mm oval or diffusion lens/cover. The stuff I have seen replaces the whole reflector (but prolly more effective).
    Man does not live by one bike alone.
    2010 Trek 4500
    2011 Trek 7.5 FX

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