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Thread: TriLux Bike Light

  1. #1
    Flashaholic
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    Default TriLux Bike Light

    Here are some pix of a MagD-based 3x3W luxeon bike light I am working on.
    Its not finished yet -- still waiting on a few parts (power cable, UCL lens,
    pot /w switch, mount, etc.) -- so I haven't ridden with it yet. But Ive sparked
    it up and I'm pretty amazed how bright it is.




    I'm using 3 TX1K Lux III's, 1000ma BuckPuck (with external pot),
    modamag's PTS2-D, IMS20 reflectors. Plan to run on Li-Ion 2400mah
    batteries in a water bottle.

    Cheers,
    Mike

  2. #2
    Flashaholic* LEDcandle's Avatar
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    Default Re: TriLux Bike Light

    Looks darn nice... I love cut-down mags... did you buy this like that or did it yourself? You have the capabilities to re-thread?

    Nice job and there's more flexibility to bike lights as there's quite a bit of space to play with

  3. #3
    Flashaholic sp5it's Avatar
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    Default Re: TriLux Bike Light

    That`s what I`m going to build but mine will be powered from 4xAA and shark driver. Witk external power socket in tailcap. And I will use it as bike light, and as EDC
    Mike

  4. #4
    Flashaholic* DUQ's Avatar
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    Default Re: TriLux Bike Light

    Nice job. Beam shots with it on the bike?
    LED's impress but Incans satisfy

  5. #5
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    Default Re: TriLux Bike Light

    Quote Originally Posted by LEDcandle
    Looks darn nice... I love cut-down mags... did you buy this like that or did it yourself? You have the capabilities to re-thread?

    Nice job and there's more flexibility to bike lights as there's quite a bit of space to play with
    Thanks LEDcandle. I cut a Mag 2D down myself with a hacksaw (carefully -- I taped the tube fully with masking tape first). I didn't rethread the tailcap. Instead, I filed down the tailcap threads just until the color disappeared from the lowest depth on the threads. It fits almost perfectly into the cutdown tube. The tailcap is kept in place with a single 4x4mm cup-point set screw I installed in the tube (you can see it in the photo). Since my batteries will be external, I wont need to open it regularly, so I'll seal it with something (maybe just teflon tape or paste will work...).

    There is definitely tons of space left inside. You could easily fit multiple drivers in there if you needed to (perhaps for a quad K2 or Lux V or extra heat-sinking??)

  6. #6
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    Default Re: TriLux Bike Light

    Quote Originally Posted by sp5it
    That`s what I`m going to build but mine will be powered from 4xAA and shark driver. Witk external power socket in tailcap. And I will use it as bike light, and as EDC
    Mike
    Thats cool -- best of both worlds: EDC + long run times if you want!

  7. #7
    Flashaholic* Krit's Avatar
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    Thumbs up Re: TriLux Bike Light

    Very good monster on your hand bike.

  8. #8

    Default Re: TriLux Bike Light

    May I suggest sealing it up but putting a bag of that moisture soaking silica gel stuff? I think it might prevent fogging up just in case...
    GLOW ME TOO WHILE YOU'RE AT IT!!

  9. #9
    Flashaholic* modamag's Avatar
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    Default Re: TriLux Bike Light

    Sawtooth: Nice Job. I like the intriging idea of using set screw to hold the tailcap. Great for those home made mods w/o a lathe

  10. #10

    Default Re: TriLux Bike Light

    Nice one!!! Looks great...

    This is what I came up with, running 14w from my dyno hub...





    Enjoy

    Ktronik

  11. #11
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    Default Re: TriLux Bike Light

    Quote Originally Posted by DUQ
    Nice job. Beam shots with it on the bike?
    Thanks DUQ. I received the UCL (its *much* nicer than the plastic stock 'lens'). I also have a power cord (not the final one though -- I was planning on using the one with a waterproof/lockable connector at batteryspace.com). I am also waiting on a handlebar mount. I have ordered (but not yet received) the Niterider universal handlebar mount which is adjustable in 3 different directions - should be more than adequate (it was also $21 + $8 shipping :-{ ). I will try to get some beam shots soon.

  12. #12
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    Default Re: TriLux Bike Light

    Krit: It is pretty bright, but maybe Ive been bitten too hard -- I want more! Im thinking a multi K2 is on the horizon....

    modamag: Thanks. The set screw seems to work just fine for my application. I think with an appropriate sealant, the light will be essentially waterproof. Probably the weakest part of the seal will be the external pot. Im not at all worried about the approaching monsoons here in New Mexico -- I think the light will be plenty watertight for that...

    OddBall: Interesting idea. I grew up on the West Coast of Canada (Victoria, BC) where it rains *alot*. If I were still there I'd be more enthused, but now I live in a high altitude desert where moisture is almost non-existent. I think I'll wait to see if its a problem. However, despite the ad-hoc nature lof the mod, I think its still pretty watertight. I think the external pot might be the weakest link. If it werent for the pot, I dont think Id have too much trouble submerging the light completely. Maybe Ill try it anyway....

    ktronik: Thats a very cool mod you have there! I opted for the longer tube because I wanted the tail pot to be easily accesible behind the handlebars.b

  13. #13
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    Default Re: TriLux Bike Light

    Here are some photos of the light on my bike -- mounted in two different positions.
    It now has a UCL lens, a longer power cord, and a Niterider Universal Mount.







  14. #14
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    Default Re: TriLux Bike Light

    I kind of like having the light out of the way under the handlebars. But its probably more effective to mount it above (in terms of illumination that is -- the higher the better).

    I have another cutdown Mag-2D (grey color) that I want to use as well, but Im waiting to do it as a quad K2. Ultimately, the pair should be quite bright together. The TriLux III is probably around 230 lumens (3x T-binned Lux III). A 4x U-binned K2 would add another 400lm or so. And a 4x V-binned K2 would add another 480 lm or so. So I could end up with as much as 710lm out of the pair which would would be quite nice. (A light-weight single or double helmet-mounted Lux-V would be a nice addition as well ....)

  15. #15
    *Retired* NewBie's Avatar
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    Default Re: TriLux Bike Light

    Nice job!

  16. #16
    Enlightened
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    Default Re: TriLux Bike Light

    Nice light, do you have any pics of it on the trail at night?

  17. #17
    *Flashaholic* andrewwynn's Avatar
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    Default Re: TriLux Bike Light

    magnificent, VERY clever solution for the threads.. and is that a pot+switch so works like a radio volume knob? all the way down is off? (that's how i did my http://mega.rouse.com (megasonic)).

    -wr


    Regulated hotwire 'the hotdriver' also for Surefire M6 • 3-level high-power LED drop-in for mag. the 'BAM!' click here
    I have disabled PMs.. use the 'email' link instead!Genesis 1:3 And God said, "Let there be light," and there was light...

  18. #18
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    Default Re: TriLux Bike Light

    Quote Originally Posted by andrewwynn
    magnificent, VERY clever solution for the threads.. and is that a pot+switch so works like a radio volume knob? all the way down is off? (that's how i did my http://mega.rouse.com (megasonic)).

    -wr
    Thanks andrewwynn. The pot+switch I will end up using is still on back-order from Digi-Key . I ordered one without a switch at the same time, so Id have something to put in there. Thats what is in there now. It still 'kinda' works like a switch in the sense that the BuckPuck is designed to be "off" when there is no (or small?) resistance through the pot. So turning it fully CCW turns off the light. I'd rather cut the primary power via a proper switch though (safer)...

    I think you can also get multi-ganged pots/switches. These might be useful for dimming multiple drivers with the same knob.

  19. #19
    *Flashaholic* andrewwynn's Avatar
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    Default Re: TriLux Bike Light

    the buckpuck draws extremely little power when 'disabled'.. but you'll prefer the operation muuuch better if you do this: put a small trim pot internal (or you can use one temporarily to find the resistance and use a resistor..) in series with the dimming pot, so you have a MINIMUM level of maybe 50-100mA.. then use a LOG or AUDIO 5K pot.. they are hard to find, 10K is easier.. put a 10K resistor in parallel with the pot to convert 10K into 5K audio pot (i found one at radio shack with a switch!). I put the main power through the switch on the audio pot with the switch on my megasonic.. check out the pics here: http://rouse.com/mega i think you can see how the pot is attached in the pics.

    -awr


    Regulated hotwire 'the hotdriver' also for Surefire M6 • 3-level high-power LED drop-in for mag. the 'BAM!' click here
    I have disabled PMs.. use the 'email' link instead!Genesis 1:3 And God said, "Let there be light," and there was light...

  20. #20
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    Default Re: TriLux Bike Light

    Hi andrewwynn,
    Thanks for the suggestion! I agree totally! I had thought of doing exactly that as well. It turns out that there is a threshold minimum current through the Lux IIIs -- i.e. I cant dim them down arbitrarily low. At their dimmest they are dimmer than I would want so it's not a problem, but I do want them to come on as soon as I turn the pot/switch on, so an internal trimpot to set the threshold would be just the ticket. Im currently using linear taper but I think its brightens the output too fast. The solution is exactly as you suggest (log taper + internal trimpots). Using two internal trim pots -- one in parallel with the main pot and one in series with the paralell combo would allow min and max thresholds to be set...

  21. #21
    *Flashaholic* andrewwynn's Avatar
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    Default Re: TriLux Bike Light

    you got it re: how to set trimpots.. you don't really need the parallel trimpot if you have a 10k audio and a 10k resistor, but it's not a bad idea either.. i htink since i just used a 10k resistor my max output was limited to 950mA vs 1000. ... log/audio taper is an absolute must.. it's nearly useless/pointless to try to dim light w/o audio taper.

    the low output .. it's very nice to have 'mood lighting'.. say you get to your destination you can have light all night long at 50mA.. but it's imossible to set with a pot that has no minimum trimmer..

    -awr


    Regulated hotwire 'the hotdriver' also for Surefire M6 • 3-level high-power LED drop-in for mag. the 'BAM!' click here
    I have disabled PMs.. use the 'email' link instead!Genesis 1:3 And God said, "Let there be light," and there was light...

  22. #22
    Flashaholic* Steve K's Avatar
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    Default Re: TriLux Bike Light

    Quote Originally Posted by ktronik
    Nice one!!! Looks great...

    This is what I came up with, running 14w from my dyno hub...


    not to detract from the TriLux, but I'm intrigued by Ktronik's light. Specifically, what did you do to get 14W from the hub dyno??

    I've got a Schmidt hub dynamo, and have looked at its behavior to figure out how to get more power out of it. At any given speed, the maximum power out is achieved by using less than the typical 0.5 amps. Figuring out where that maximum power point is located is the trick, as well as figuring out how to adjust the load's behavior as a function of speed.

    One approach is to simply switch more leds in series as the speed goes up, which is probably the most practical method. Was this used for this light, or does it use some truly clever approach not heard of before??? :-)
    Mr Bandgap and I have traded a few ideas back and forth, and he has put together a nice circuit that switches a second incandescent bulb in series with a first bulb when a speed threshold is reached. I'm always intrigued by new ways of attacking this problem.

    thanks,
    Steve K.

  23. #23
    *Flashaholic* greenLED's Avatar
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    Default Re: TriLux Bike Light

    Sawtooth, what's that attachment you're using to secure the light to the handlebar? Any links, please?

    Nice job on the mod!

  24. #24

    Default Re: TriLux Bike Light

    NITERIDER UNIVERSAL HANDLEBAR MOUNT

    http://www.jensonusa.com/store/produ...bar+Mount.aspx
    Far too many expensive custom lights than I dare admit to owning..especially to wife.com !

    List of custom and OEM lights edited for bandwidth

  25. #25

    Default Re: TriLux Bike Light

    Quote Originally Posted by Steve K
    not to detract from the TriLux, but I'm intrigued by Ktronik's light. Specifically, what did you do to get 14W from the hub dyno??

    I've got a Schmidt hub dynamo, and have looked at its behavior to figure out how to get more power out of it. At any given speed, the maximum power out is achieved by using less than the typical 0.5 amps. Figuring out where that maximum power point is located is the trick, as well as figuring out how to adjust the load's behavior as a function of speed.

    One approach is to simply switch more leds in series as the speed goes up, which is probably the most practical method. Was this used for this light, or does it use some truly clever approach not heard of before??? :-)
    Mr Bandgap and I have traded a few ideas back and forth, and he has put together a nice circuit that switches a second incandescent bulb in series with a first bulb when a speed threshold is reached. I'm always intrigued by new ways of attacking this problem.

    thanks,
    Steve K.
    OT: Please post on my 14w dyno page so not to hyjack this post..

    Load matching is the key...

    The maximum power is achieved at a specific load current. This depends little on the speed, but mostly on the dynamo. In other words: A dynamo is a current source.

    This guy did most of the hard work...

    load matching

    dyno circuits

    my post w new pics

    I just used his circuit for the shimano hub...have not tested with SON...



    This is a voltage dub circuit & full wave rectifer circuit...

    Just make the full wave bit to start, use it to find the sweet spot for your hub...

    I would like the data you come up with, so if I can help, please let me know...

    I can make you a circuit if needed...

    I also have the PCB for the auto switching unit...

    Try 3 & 4 leds in series... I have moved to 3 leds in a trilux config, better @ slower speed...

  26. #26
    Flashaholic* Steve K's Avatar
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    Default Re: TriLux Bike Light

    hey Ktronik, where's your 14W light page??

    to minimize the hijacking already in progress, let me offer these quick comments:

    1. it looks like a cap is added in series to the dynamo output to match the load's complex impedance to the dynamo's.
    2. ummmm.... what were my other comments? I liked the links you provided. Interesting stuff.

    I've discussed the idea of matching complex impedances with other folks, and was told that it works, but is only effective over a narrow range of speeds. I haven't tried it myself because I have some 14% grades to grind up, and need good performance at 5mph as well as 18mph.

    Adding loads in series as the dynamo speed increases is a more conventional way to get more power out. For a multi-LED arrangement, it would be great to switch each led in at a separate speed. Kinda complicates the electronics, though...

    I think my biggest question was: where's the 14W led light?? The schematic showed 4 one watt leds, right?

    FWIW, I'm using a 5W Luxeon with my Schmidt dynamo. Works darned nice! Some paralleled leds are added in series for the taillight, and it pretty much meets all of my needs.

    okay.. that's enough out of me! Back to the TriLux talk.....

    Steve K.

  27. #27

    Default Re: TriLux Bike Light

    Quote Originally Posted by Steve K
    hey Ktronik, where's your 14W light page??

    to minimize the hijacking already in progress, let me offer these quick comments:

    1. it looks like a cap is added in series to the dynamo output to match the load's complex impedance to the dynamo's.
    2. ummmm.... what were my other comments? I liked the links you provided. Interesting stuff.

    I've discussed the idea of matching complex impedances with other folks, and was told that it works, but is only effective over a narrow range of speeds. I haven't tried it myself because I have some 14% grades to grind up, and need good performance at 5mph as well as 18mph.

    Adding loads in series as the dynamo speed increases is a more conventional way to get more power out. For a multi-LED arrangement, it would be great to switch each led in at a separate speed. Kinda complicates the electronics, though...

    I think my biggest question was: where's the 14W led light?? The schematic showed 4 one watt leds, right?

    FWIW, I'm using a 5W Luxeon with my Schmidt dynamo. Works darned nice! Some paralleled leds are added in series for the taillight, and it pretty much meets all of my needs.

    okay.. that's enough out of me! Back to the TriLux talk.....

    Steve K.
    Ktronik 14w Dyno post page

    Yes the curves, are tight, but you can change them to be wider + you are using 2 different curves, one in the voltage dob & one in the full wave ref, slow speed no problem gives good light @ 5km/hr!!

    Trust me, its the least work needed for a manual switching unit, I also have PCBs now for the Auto switcher between curves..

    YOU MUST try these very simple circuits just to prove that yours are better...or not... I have change the circuit a little (different cap config & a bigger standby cap...

    Ok using the voltage dob/ full wave ref circuit.. into 4/ series 3w stars I get:

    Volt db:
    10km/hr, 250ma
    15km/hr, 300ma
    30km/hr, 250ma

    3/ 3w in series gives more power @ lower speeds...

    Full wave:

    30km/hr, 500ma
    40km/hr, 900ma
    44km/hr, 800ma

    so power @ low speed is ok for me...used a flater curve for the voltage db circuit, more down the bottom end & less drop to transition...
    Then a more peaky curve for the full wave so I could hit the max... not too worried about the other side of that curve as not much riding is above 50km/hr...


    Sorry Sawtooth no more post here...

  28. #28
    *Flashaholic* greenLED's Avatar
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    Default Re: TriLux Bike Light

    for the link, Banshee!

  29. #29
    Flashaholic* Icarus's Avatar
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    Default Re: TriLux Bike Light

    Great pics guys!

    I have one in the works too (very short cut downs Mag2C) but I'm strugling with mounting it on the handle bar. Any suggestions?

  30. #30

    Default Re: TriLux Bike Light

    Quote Originally Posted by Icarus
    Great pics guys!

    I have one in the works too (very short cut downs Mag2C) but I'm strugling with mounting it on the handle bar. Any suggestions?

    For My Sub C cutdown bike M@g I used a reflector clamp mounted to the tail cap

    very strong very small... works great...

    As I run a bike shop I have 100's!!!!!! how many do you want???

    I can take pic's if you need...

    Thanks

    Ktronik

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