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  1. #1
    Dirt Bomb sknhgy's Avatar
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    Cheap, powerful rear light?

    I have come across this light, but I haven't bought one or seen one. Anyone know anything about them?

    http://www.dealextreme.com/details.dx/sku.20333
    more cops have been killed by donuts than guns in chicago it is a medical fact ask any doctor.

  2. #2
    AEO
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    looks promising, nice find.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  3. #3
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    Yep, nice find.

    Ok, bought one.
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  4. #4
    Gray Haired Commuter
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    Dang it...just when I thought I was all set with my rear lighting, this pops up. Maybe a couple of these attach to the seat stays.
    Dave Clary
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  5. #5
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    Just bought one of these as well - Glass Optic
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  6. #6
    AEO
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    tell us how it goes.
    but I'm curious, why a converging lens?
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  7. #7
    Galveston County Texas 10 Wheels's Avatar
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    Quote Originally Posted by sknhgy View Post
    I have come across this light, but I haven't bought one or seen one. Anyone know anything about them?

    http://www.dealextreme.com/details.dx/sku.20333
    One Hour Run Time.

    Way Too Short.
    [SIZE=1][B]What I like about Texas[/B]
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  8. #8
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    Quote Originally Posted by AEO View Post
    tell us how it goes.
    but I'm curious, why a converging lens?
    It's a torch, without a secondary lens it's only going to be visible from directly behind.
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  9. #9
    AEO
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    the 1hr run time is probably inaccurate because the power draw and run time don't add up according to the posts on DX.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  10. #10
    AEO
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    Quote Originally Posted by Unknown Cyclist View Post
    It's a torch, without a secondary lens it's only going to be visible from directly behind.
    then wouldn't you want a diverging lens?
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  11. #11
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    Quote Originally Posted by 10 Wheels View Post
    One Hour Run Time. Way Too Short.
    I'm pretty sure that's a mistake.

    Red LEDs are usually lower voltage than white, also they claim 800mA regulated which would probably give more like 3 hours.

    Personally I suspect the LED is receiving less than 800mA and runtime will be proportionally longer.

    If it is running at 800mA expect dinotte levels of brightness !!

    However, I'll let you know when it arrives...

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  12. #12
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    Quote Originally Posted by AEO View Post
    then wouldn't you want a diverging lens?
    My thought too, the reviews are talking about setting things on fire and melting plastic, not casting a nice wide, visible from every angle beam.
    2009 Motobecane Fantom CX
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    Ok, here's some specs: Luxeon K2 red LED

    Lumens 75 lm @ 700mA, 45 lm @ 350mA.
    Max Continuous Current 700 mA
    Forward Voltage 3.4 Vf
    Dominant Wavelength 627 nm
    LED Type K2
    Radiation Pattern Lambertian
    Weight 0.78g

    Due to thermal management I suspect it's more likely to be about 500mA than 800mA.

    Also all the torches I've bought from DX so far have been below the claimed power rating.

    Runtime tests, volt and amp measurements to follow.....

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  14. #14
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    Quote Originally Posted by AEO View Post
    then wouldn't you want a diverging lens?
    If it's converging, it has a focal point ?
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  15. #15
    AEO
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    depends on how you want to use it, collimator, converging and diverging lenses.
    the curved mirror collimator on the light seems to give a nice beam angle from the shots on the site.

    depending on the power it has, it might even be nice to use a diffusion lens on it.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  16. #16
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    Quote Originally Posted by AEO View Post
    depends on how you want to use it, collimator, converging and diverging lenses.
    the curved mirror collimator on the light seems to give a nice beam angle from the shots on the site.

    depending on the power it has, it might even be nice to use a diffusion lens on it.
    Looks like it has a simple O/P reflector in it, to me.
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  17. #17
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    yes, nice find. just ordered two.

  18. #18
    Senior Member SlimAgainSoon's Avatar
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    $10. Free shipping. That's a find.

    I've been looking for something like this -- a rear light to run on 18650 batteries.

  19. #19
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    Quote Originally Posted by AEO View Post
    then wouldn't you want a diverging lens?
    Ok..find me one ?
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  20. #20
    AEO
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    not a clue.

    Converging or flat lens is the norm since the diverging part is easily attained by just removing the collimator.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  21. #21
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    Quote Originally Posted by AEO View Post
    not a clue.

    Converging or flat lens is the norm since the diverging part is easily attained by just removing the collimator.
    You are going to have to clarify what you mean by collimator - this torch has appears to have a simple O/P reflector and as the LED is recessed maybe 20mm inside the front of the torch removing the REFLECTOR will have little beneficial effect.

    I do have similar size ultrafire torches here and removing the reflector while wasting a lot of light allows a wider angle cone of light to be emitted - however it isn't anywhere near wide angle as a cycle rear light.

    I'm hoping it will be possible to harness all the light output and direct it where required.

    I'll experiment more when the torch arrives.

    It may well be that better results can be achieved if the assault crown didn't block so much light.



    EDIT: Interestingly, I just realised that the red Luxeon LED is a Lambertian so most of the emitted light is going to go straight out the lens without touching the reflector anyway, so removing the reflector will have much less effect than it does on my white LED Ultrafire torches.
    Last edited by Unknown Cyclist; 03-13-09 at 05:49 PM.
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  22. #22
    Senior Member Ziemas's Avatar
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    Sadly it's only one mode, which means no flashing or strobe.

  23. #23
    Senior Member cyclezealot's Avatar
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    Planet Bike's "blinky "Super Flash.." They are amazing.
    Pray for the Dead and Fight like Hell for the Living






    ^ Since January 1, 2012

  24. #24
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    Quote Originally Posted by Ziemas View Post
    Sadly it's only one mode, which means no flashing or strobe.
    Suits me

    There are plenty of blinky lights available

    EDIT: mine's in 'packaging' whatever that means....
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  25. #25
    Gray Haired Commuter
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    Quote Originally Posted by Unknown Cyclist View Post
    EDIT: mine's in 'packaging' whatever that means....
    Means it could still be another week before it ships.
    Dave Clary
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