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Difference between Ultrafire WF-501B and WF-502B?

  • Marble Top 10 Forum Poster Thursday, June 19, 2008 10:23 AM Reply
    Im looking for a new flashlight, since my other Ultrafire died on me. Ive been checking all the flashlights threads on DX and came to the conclusion that Id like to stick with the Ultrafire brand. Preferably the WF-501B (SKU 1315) and WF-502B (10709 or 3371; difference in output?)

    Main question is which one should I get, the 501B or the 502B? I also like to get myself some extra drop-in modules. But here are also different options available; SKU's 13658, 11836, 13802, 12501. There are several others, but Id like to have a light with more flood than throw, durability yet also with a high output option.

    If youd like to share your thoughts on this, be welcome!
    Stop global warming!! Become a pirate!! NL

    +1 on (genuine) HTC Touch accessories
  • Marble Top 10 Forum Poster Friday, June 20, 2008 1:34 AM Reply
    ¤BUMP¤ 0:)
    Stop global warming!! Become a pirate!! NL

    +1 on (genuine) HTC Touch accessories
  • _Diceman Friday, June 20, 2008 3:01 AM Reply
    Forget the P60's, they don't have ideal thermal transference for LEDs. Choose a torch where the LED can be accessed so future upgrades are possible.
    Those are my thoughts.

    Posts(481) | Reviews | Tip post

    post edited by _Diceman on 6/20/2008 at 3:02 AM
  • gearhounds Friday, June 20, 2008 7:57 PM Reply
    I have this 502b and run the R2 p60 1 mode drop in with sku 6979 unprotected 18650 battery. While not as bright as with 2 cr123 primary's the output is surprisingly strong. Best of all, with 18650's this drop in barely gets above room temperature. If you want a very bright light I'd avoid sku 3371 as the suggested output is fairly low. I am toying with my 502b by wrapping the drop in with copper wire to make full contact with the inside diameter of the light body to dissapate heat more effectively with 123's. While I do not have a 501b, it has a good reputation so the difference between the 2 will likely be a question of aesthetics.
  • Jmarji Friday, June 20, 2008 8:39 PM Reply
    WF-501B is a cree LED, and WF-502B is a UV light.

    WF-502B is a great UV light and is awesome with the the R2 drop in...

    I would get WF-502B + R2...

  • Jmarji Friday, June 20, 2008 8:41 PM Reply
    gearhounds you use the WF-502B + R2 + cr123a?

    Does not dammage the R2? Just gets hot? How long do you run it for, how much brighter?

  • gearhounds Saturday, June 21, 2008 6:09 AM Reply
    The most input I use for the R2 is cr123 primary's; reading others test results, all this drop in seems to do above about 6.5V is get hotter with little or no increased output. With primary's, I find that it does get pretty warm but not excessively so. I use it mainly with a 18650 and it hardly gets warm at all. It is significantly brighter with the primary's though. I think wrapping the drop in as much as possible with copper wire will really help draw off heat as there is not enough contact between it and the flashlight metal under normal circumstances.
  • naked222 Friday, July 11, 2008 4:34 PM Reply
    @Marble: The 501B and 502B are BOTH P60 hosts, it's a matter of which body-style you prefer.

    P60-style modules come in all types; Cree LED (P4, Q5, and R2 bins, as well as UV [like this one], and IR), SSC P4 LED, Rebel LED, and of course the dinosaur, xenon! The original xenon replacement lamp is made by SureFire, whose part number is "P60", hence the denotation "P60-style module".

    The 501 series comes in four models; A, B, C, and D, accepting 1, 2, 3, or 4 CR123A sized cells (also 16340/RCR123A) each, respectively.

    The 501B will also accept a single 17670 or 18650. I use it with a Cree Q5 drop-in and 18650s as my tool-belt light. My work takes me into attics and under houses, and this set-up is very reliable.

    The 501C will also accept 2x 17500/18500. I use it with a Cree R2 drop-in and 2x 18500s. It's VERY bright (no heat issues for me) with excellent run-time, and still one of my all-time favorite lights. I keep it in a kitchen drawer.


    The 501D will also accept 2x 17670/18650. Imo, a light this long should have a larger head, so I don't own one.

    The 501A will also accept a single 17500 (inside dia. too small for 18500s) with a minor modification to the drop-in module. If you unsolder and remove the center spring from the module, a 17500 will fit. You also have to unscrew the bezel from the head and the head from the body tube a couple threads each to get the tailcap on. Although all three joints have no o-ring showing, I duobt it's still waterproof, water resistant at best. It's a small, bright (I use R2 here also), handy light to have around, with a very decent run-time, another one of my favorites!

    Btw, all the above combos will accept flat-top cells (except the A w/mod), although two cell set-ups will need a magnetic spacer between cells.

    Other than styling, the 502 series is the same, except there's only B, C, and D (no "A" model). I don't have any 502s (of ANY kind, pun intended!), but this one with UV drop-in for less than eighteen bucks sure is on my wish-list!
    I'd rather have a flashlight in front of me than a
    "frontal flashlightomy"!
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    post edited by naked222 on 7/11/2008 at 4:40 PM
  • JMGallego Tuesday, July 29, 2008 7:31 PM Reply
    I am new with these flashlights and I am considering purchasing the WF-502 1W UV flashlight and would like to order a couple of "drop-ins". However, I am lost in trying to pick up one. My understanding is the Cree XR-E Q5 are the best as power (brightness) and color (true white) and I not sure which of these are the best one:


    SKU.13802 http://www.dealextreme.com/details.dx/sku.13802
    SKU.11621 http://www.dealextreme.com/details.dx/sku.11621 or
    SKU.6090 http://www.dealextreme.com/details.dx/sku.6090

    Any suggestions? I am currently leaning toward the 13802.

    THANKS!

    naked222:

    P60-style modules come in all types; Cree LED (P4, Q5, and R2 bins, as well as UV [like this one], and IR), SSC P4 LED, Rebel LED, and of course the dinosaur, xenon! The original xenon replacement lamp is made by SureFire, whose part number is "P60", hence the denotation "P60-style module".
    Posts(73) | Reviews | Tip post

    post edited by JMGallego on 7/29/2008 at 7:35 PM
  • gearhounds Saturday, August 02, 2008 7:41 AM Reply
    Any of the drop ins you listed are good ones. Also consider sku 11836 as I have found it slightly whiter and brighter than 11621 (negligable). The 502b is a great choice for a host if you want a dual light with UV capabilities. The new Ultrafire C1 offerings are good choices if you don't want the UV. If you get the 502b, just remember to take it completely apart and knock out the plastic disc from the flashlight tube, if it is still manufactured with one. It is troublesome, useless, and not neccessary.
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