Page 1 of 2 1 2 LastLast
Results 1 to 25 of 33
  1. #1
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45

    Double Seoul P4 LED light - made of heatsink

    Hello, everybody~

    I made my bike light with two Seoul P4 LED.

    The housing is made of heatsink.


    Here is my LED light database.

    Light Source:

    2 Seoul P4 LED (bin code: USXPI)
    drive current: about 830mAh

    Optics / Reflectors / Lens:

    20mm collimator x 2
    6 and 10 degree

    Housing:

    made of heatsink
    20 x 45 mm sized heatsink x 6

    Power Source:

    7.4V 6600mAh lithium ion battery
    (originally, I use this battery with 6V 10W Halogen light)

    Regulator:

    one 5W 1.2ohm resistor only
    didn't use regulator

    Photos:

    1. 20 x 45 mm sized heatsink.


    2. Assembly picture


    3. Complete picture


    4. On handlebar - off


    5. On handlebar - on



    If the photos are not visible.
    Click below link.
    http://picasaweb.google.co.kr/uroest/OYJiQJ
    Last edited by Narajjang; 09-07-2007 at 08:07 PM.

  2. #2
    fuggansonofahowa
    Reputation: Hawseman's Avatar
    Join Date
    May 2007
    Posts
    766
    Nice job....very clever, Narajjang. You've got yourself a heck of a inexpensive light.

    Couple of questions...

    That's one monster of a resistor. How is it mounted & how's the heat?

    What kind of bar mount is that?

  3. #3
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by Hawseman
    Nice job....very clever, Narajjang. You've got yourself a heck of a inexpensive light.

    Couple of questions...

    That's one monster of a resistor. How is it mounted & how's the heat?

    What kind of bar mount is that?

    Thanks.
    The heat of resistor is less than that of LEDs.
    So, it can be ignored.
    The total heat of light is tolerable because the housing is made of heatsink.

    The bar mount is trainer's remote mount.
    (Minoura E-RDA 850)
    Last edited by Narajjang; 08-20-2007 at 05:34 PM.

  4. #4
    Gone riding
    Reputation:
    Join Date
    Jan 2004
    Posts
    3,369
    Nice design, and thank you for your database entry too!

    I have often wondered about some of the various heat sink extrusions that you can find online, as many have slots and channels milled in to them that may make a very nice housing. It’s just a matter of finding something with the right dimensions!

    Dave.

  5. #5
    Spanish biker
    Reputation: msxtr's Avatar
    Join Date
    Dec 2006
    Posts
    734
    Wowwwwwwwwwwwwww incredible, I'm like it very, very much!!!!!!!!

    Where you bought the 10 optic??

    Greetings - Saludos

    msxtr
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  6. #6
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by msxtr
    Wowwwwwwwwwwwwww incredible, I'm like it very, very much!!!!!!!!

    Where you bought the 10 optic??

    Greetings - Saludos

    msxtr

    Thank you very much, msxtr~

    I think you made the LED lights much better than me.

    I bought 10 degree optic at offline shop.

    *) My english is very very bad, too.

  7. #7
    Spanish biker
    Reputation: msxtr's Avatar
    Join Date
    Dec 2006
    Posts
    734
    Quote Originally Posted by Narajjang
    Thank you very much, msxtr~

    I think you made the LED lights much better than me.

    I bought 10 degree optic at offline shop.

    *) My english is very very bad, too.
    Thanks to you too

    Now I have see that you use a cygolite led light?? I have a cygolite but this are with hallogen bulb, could you put photos of into your cygolite light, to see how are for into and so I will can copy the desing to do my cygolite with led light

    Thank you very much for all

    Greetings - Saludos

    msxtr
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  8. #8
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by msxtr
    Thanks to you too

    Now I have see that you use a cygolite led light?? I have a cygolite but this are with hallogen bulb, could you put photos of into your cygolite light, to see how are for into and so I will can copy the desing to do my cygolite with led light

    Thank you very much for all

    Greetings - Saludos

    msxtr
    Yes, msxtr. I use a cygolite LED light.
    The model name is Hi-Flux 100.
    I bought it at the pricepoint.com.
    (http://www.pricepoint.com/detail/157...Bike-Light.htm)

    Originally, it is operated with 4 c-sized cell and 3 watt Luxeon LED is uesd.
    The brightness of this light is about 7 watt halogen.
    (they say this is equivalent of 10 halogen watts...but i don't think so)

    So, I change luxeon LED to Seoul P4.
    And i use lithium ion battery instead od 4 c-sized cell.
    (I use Y-cable to operate this modified cygolite & double P4 light)
    Now, the brightness is much improved.
    I think it is really equivalent of 10 halogen watts after LED change.

    I think the outcasing is same with that of halogen version.
    The different point is the LED version has 35mm optic, a heatsink and a resister inside.
    I will show you detail photo of cygolite LED light soon.
    (When i come back to home at night. This is 10 AM here.)

    Thank you, msxtr.

  9. #9
    Spanish biker
    Reputation: msxtr's Avatar
    Join Date
    Dec 2006
    Posts
    734
    Quote Originally Posted by Narajjang
    Yes, msxtr. I use a cygolite LED light.
    The model name is Hi-Flux 100.
    I bought it at the pricepoint.com.
    (http://www.pricepoint.com/detail/157...Bike-Light.htm)

    Originally, it is operated with 4 c-sized cell and 3 watt Luxeon LED is uesd.
    The brightness of this light is about 7 watt halogen.
    (they say this is equivalent of 10 halogen watts...but i don't think so)

    So, I change luxeon LED to Seoul P4.
    And i use lithium ion battery instead od 4 c-sized cell.
    (I use Y-cable to operate this modified cygolite & double P4 light)
    Now, the brightness is much improved.
    I think it is really equivalent of 10 halogen watts after LED change.

    I think the outcasing is same with that of halogen version.
    The different point is the LED version has 35mm optic, a heatsink and a resister inside.
    I will show you detail photo of cygolite LED light soon.
    (When i come back to home at night. This is 10 AM here.)

    Thank you, msxtr.
    Hi, Too you have upgraded the cygolite with a seoul...? you are a freak

    Ok, I will wait your detail photos.

    Thank you very much for your help

    Greetings - saludos

    msxtr
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  10. #10
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by msxtr
    Hi, Too you have upgraded the cygolite with a seoul...? you are a freak

    Ok, I will wait your detail photos.

    Thank you very much for your help

    Greetings - saludos

    msxtr

    Hi~msxtr.
    These are the photos of my modified cygolite LED light.

    1. Overview. The light can be operated in 2 mode(high & low) by remote switch.
    Note I changed c-cell battery pack to DC jack



    2. The front cover is removed.


    3. A plastic ring between optic and LED.
    MR 11 halogen lamp is fit for this ring, too.
    (I thing this ring is used in halogen version. Isn't it?)


    4. The optic. The diameter of this optic is 35mm.(same with MR11 halogen)


    5. Now, the plastic ring is removed.
    Note I change original luxen 3 watt LED to Seoul P4 LED.


    6. The heatsink.
    There is no regulator behind the heatsink.
    Instead of regulator, a resistor is attached on the front of white plastic part.



    7. Behind the heatsink.


    8. Overview of all parts.
    The rubber ring is placed between the front cover and the optic.



    I hope these photos can be helpful to you, msxtr.
    By the way, what's the meaning of 'saludos'?


    *) If the photos are not visible.
    Click below link.
    http://picasaweb.google.co.kr/uroest/Cygolite
    Last edited by Narajjang; 09-07-2007 at 08:59 PM.

  11. #11
    Spanish biker
    Reputation: msxtr's Avatar
    Join Date
    Dec 2006
    Posts
    734
    Narajjang Wowwwwww Yes you have help to me very, very much!!!!!!!!!!

    Excellent description and photos

    The O-ring in the halogen version, don't are, the MR-11 bulb go directy of the front cover, but this don't problem I can buy this O-ring without problems. Now I have of think how I do a heatsink of the suitable measures to put into the lamp

    I have a optic called MOBDAR that are exactly of this measure (MR-11, 35mm), I think that are the same that use your lamp...

    Saludos are the same of Greetings, but in spanish That all learn languages of another countries

    By the way, with this resistor work to 1a the led? have you measured the current to led?

    Greetings - Saludos

    msxtr
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  12. #12
    mtbr member
    Reputation:
    Join Date
    Nov 2005
    Posts
    500
    Narajjang. Awesome chop job on that heatsink to build a cool and economical light.
    Have you measured the current you get at the LEDs using the 5W, 1.2 ohm resistor?

  13. #13
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by msxtr
    Narajjang Wowwwwww Yes you have help to me very, very much!!!!!!!!!!

    Excellent description and photos

    The O-ring in the halogen version, don't are, the MR-11 bulb go directy of the front cover, but this don't problem I can buy this O-ring without problems. Now I have of think how I do a heatsink of the suitable measures to put into the lamp

    I have a optic called MOBDAR that are exactly of this measure (MR-11, 35mm), I think that are the same that use your lamp...

    Saludos are the same of Greetings, but in spanish That all learn languages of another countries

    By the way, with this resistor work to 1a the led? have you measured the current to led?

    Greetings - Saludos

    msxtr

    I'm happy my photos are helpful to you.

    I didn't measure the current to LED.
    (My amperemeter can measure 500mA max)
    But I think it doesn't work to 1a to LED.

    I use this fomula.
    R = (V - Vf) / I
    (R=resistor, V=battery voltage, Vf=forward voltage of LED, I=ampere)

    I use 7.4 volt lithium ion battery.
    But after full charge, Max voltage of this battery is up to 8.4 volt.
    Soon it decrease to 8.0 volt.
    Vf of USXPI bin LED is 3.25~3.5 volt.
    Target amp is 1000mA.(=1.0A)

    Put these to above formula.
    R = (8.0 - 3.5) / 1.0 = 4.5
    But I can't get 4.5 ohm resistor.
    So I use 5W 4.7 ohm cement resistor.

    *) The original resistor of this light is 5.6 ohm axial resistor.
    But it can't stand heat when connect lithium battery instead of C sized cell)

    Put R as 4.7 to above formula.
    I = (8.0 - 3.5) / 4.7 = 0.9574...

    So, I guess the current to LED is about 950mA.


    *) Another way...put all data to this resistor calculator in luxeon homepage.
    (http://www.luxeonstar.com/resistor-c...48daae7f0206fc)

    The result is similar.
    A 4.7ohm 5 watt resistor is needed.
    LED current is 950mA


    Anyway...I think this resistor eat too much power.
    So, I made double P4 LED light.


    Saludos, msxtr.
    Last edited by Narajjang; 08-26-2007 at 08:05 PM.

  14. #14
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by achesalot
    Narajjang. Awesome chop job on that heatsink to build a cool and economical light.
    Have you measured the current you get at the LEDs using the 5W, 1.2 ohm resistor?

    Thank you very very much, achesalot.


    I didn't measure the current to LED because my amperemeter can measure 500mA max.

    I think the current to LED is about 800~850mA.
    Because...

    1. when using this resistor calculator.
    http://www.luxeonstar.com/resistor-c...48daae7f0206fc

    Source voltage as 8.0 volt
    LED forward voltage (Vf) as 7.0 volt (2 USXPI bin P4 LED in series...3.5 + 3.5 = 7.0)
    LED operating current as 900mA

    The results are..
    need 1.2 ohm 1 watt resistor
    Actual LED current is 833mA

    2. burning time
    when I use my double P4 with 7.4V 4.0AH lithium battery.
    The burning time is about 4.2 hours.
    4.0 / 4.2 = 0.95...
    Considering power-loss by resistor, the current will be about 800mA


    Your http://myfwyc.org/bikeled/DIY_LED_Bi...ing_Guide.html was very heplful to me.
    I am making 2nd double P4 light for helmet as your way.




    Saludos~


    *) If the photos are not visible.
    Click below link.
    http://picasaweb.google.co.kr/uroest/ufUhuK
    Last edited by Narajjang; 09-07-2007 at 09:01 PM.

  15. #15
    Spanish biker
    Reputation: msxtr's Avatar
    Join Date
    Dec 2006
    Posts
    734
    Narajjang Hi, Another double light?? Now I try with Cree leds Q2 or Q5 version, perhaps you get better light with this leds that don't with the seouls...

    By the way, buy a good tester (voltimeter-amperimeter), this don't are very expensive and that you could measure well to 1a or more

    By the way (2) how said by your country "saludos?"

    Greetings - Saludos

    msxtr
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  16. #16
    Spanish biker
    Reputation: msxtr's Avatar
    Join Date
    Dec 2006
    Posts
    734
    Sorry, double post.
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  17. #17
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Hi~ msxtr.

    I heard about Cree's Q2 and Q5.

    But I don't know where I can get it.

    Here, in South Korea...They don't sell Cree LED both on-line and off-line shop.

    Do you know where I can buy Cree LED by on-line?

    I want to know on-line shop where can send Cree LED to me by international delivery.


    Anyway, I'll buy better tester soon.

    And...we say "An Nyung Ha Se Yo" when we say hello to others.


    Greetings - An Nyung Ha Se Yo~~Saludos~~

    Narajjang
    Last edited by Narajjang; 08-27-2007 at 06:44 PM.

  18. #18
    mtbr member
    Reputation:
    Join Date
    Nov 2005
    Posts
    500
    Thanks for the detail Narajjang. Using the resistor is a good tip for cutting the cost of building an LED bike light. The Seoul P4 (U-bin) are just as bright, if not brighter than the Cree Q2 and possibly the Q5 ... and they are usually cheaper and wok well with most Luxeon III optics. I'll agree that Cree has a little tighter binning of their LEDS, and possibly better QC. If you're interest in the Cree Q5 bin:
    http://www.dealextreme.com/details.dx/sku.2394

    Glad to see you're trying one of the square aluminum tube designs.
    - allen

  19. #19
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by achesalot
    Thanks for the detail Narajjang. Using the resistor is a good tip for cutting the cost of building an LED bike light. The Seoul P4 (U-bin) are just as bright, if not brighter than the Cree Q2 and possibly the Q5 ... and they are usually cheaper and wok well with most Luxeon III optics. I'll agree that Cree has a little tighter binning of their LEDS, and possibly better QC. If you're interest in the Cree Q5 bin:
    http://www.dealextreme.com/details.dx/sku.2394

    Glad to see you're trying one of the square aluminum tube designs.
    - allen

    Thank you very much for your opinion, achesalot.

    I've never seen Cree Q2 and Q5.
    I think the brightness is...Q5 > Q2 = Seoul P4...isn't it?

    A question to you...is...
    Is dealextreme.com reliable site?...such as quick delivery, payment...ect.

    Second question to you, which is the best adhesive between aluminum tubes?

    I'll show you your tube design light when I complete them.

  20. #20
    mtbr member
    Reputation:
    Join Date
    Nov 2005
    Posts
    500
    Quote Originally Posted by Narajjang
    Thank you very much for your opinion, achesalot.

    I've never seen Cree Q2 and Q5.
    I think the brightness is...Q5 > Q2 = Seoul P4...isn't it?
    I think that's about right.

    Quote Originally Posted by Narajjang
    A question to you...is...
    Is dealextreme.com reliable site?...such as quick delivery, payment...ect.
    I have not had any problems with DE, and seem to have good reputation.

    Quote Originally Posted by Narajjang
    Second question to you, which is the best adhesive between aluminum tubes?
    TIG Welding But if you don't have that... I use a product called J-B Weld. There might be other similar metal adhesives available in your part of the world.

    Quote Originally Posted by Narajjang
    I'll show you your tube design light when I complete them.
    I always look forward to seeing what everyone builds, whether it's my design, a variation of it, or something totally different... keep up the good work!

  21. #21
    Spanish biker
    Reputation: msxtr's Avatar
    Join Date
    Dec 2006
    Posts
    734
    Narajjang Hi, I see that have response to you achesalot to your questions, nevertheless, I bought my leds in www.dealextreme.com, they have a great service, too you can buy to www.kaidomain.com here I bought too and works perfectly, the pay are in both shops widh paypal and the shippings cost are free to wordwide. Sometimes in www.dealextreme, any led are damaged, but I have write to they and they send to me another that work well.

    By the way, that difficult to say "saludos" in your language...

    An Nyung Ha Se Yo

    msxtr
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  22. #22
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Thank you very much for good advise, achesalot and msxtr.

    achesalot
    I think I should find J-B Weld or other similar metal adhesive.
    I hope you keep up good idea for light to me.

    msxtr
    I will visit both dealextreame and kaidomain web site.
    I hope you keep up good idea for light to me, too.
    saludos~

  23. #23
    Person
    Reputation:
    Join Date
    Sep 2005
    Posts
    775
    Very cool light Narajjang.

    Would it work with a 7.2v Nicad battery pack? I assume it would work ok when freshly charged, but not sure once it runs down a bit.

  24. #24
    mtbr member
    Reputation:
    Join Date
    Dec 2006
    Posts
    45
    Quote Originally Posted by Baulz
    Very cool light Narajjang.

    Would it work with a 7.2v Nicad battery pack? I assume it would work ok when freshly charged, but not sure once it runs down a bit.

    Hi, Baulz.

    I didn't connect my light with Nicad battery.
    But when I connect my light with 6V Lead-Acid battery(freshly charged voltage is 7.2 volt), it works well.
    (My light didn't uses regulator, so it works well with little lower voltage. but the brightness will decrease little too.)

    So, I think it will work well 7.2V Nicad battery.

  25. #25
    mtbr member
    Reputation:
    Join Date
    Sep 2007
    Posts
    8
    I don't see the photos, nor can I find the links for the photos.

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •