Tripple L.E.D. "Pond Scum" build- Mtbr.com
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  1. #1
    I ride bicycles sometimes
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    Tripple L.E.D. "Pond Scum" build

    Hey guys this was my first light build and most likely not my last. I wanted to start out as easy and as simple as i can and progress from there, so its not hard to see why i chose the "pond scum" build. Thanks to this forum and its awesome DIY threads, i can finally ride at night instead of sitting at home.


    For my first light, i wanted to keep the costs as low as possible and i can say that this cost just under $100 if you have electrical tape, shrink wrapping, a switch, and a way to mount it to your bars. All of which can easily be laying around the house. If not, its still very affordable.


    I went with this LED from HD... This thing is plenty bright and uses a fraction of the wattage of the halogen. Not to mention that it practically gives of NO heat at all. I should of taken more pictures but im stuck with my cellphone only at the moment. This bulb has what looks like 3 cree led's in it and gives off a very white light. As apposed to the halogen yellow. It was $30 dollars!!!



    Now the battery pack. I made a 14.4v 2650mAh pack with some AA holders and Duracell Batteries. Total about $50 bucks



    Here it is all wired up and in its pouch. For the mount, i used a old reflector mount that was laying around from my bike. Works PERFECT. The actual housing was $10 at harbor freight. (picture with old halogen)



    Here it is mounted. (before i finished trimming the housing and this picture is with old halogen)



    So after i got a switch on this thing i took it out for a ride and i was truly impressed.
    Take these pics with a grain of salt because i took them with my iphone. I had no trouble getting around the pitch black woods and never outran the light at my normal pace. It wouldnt hurt for a helmet mounted spot, but this light is a GREAT start. So far it lasts 2hours +.







  2. #2
    Light freak
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    The PondScum is still alive!!

    Nice job Fuze911. Thanks for posting it up.

  3. #3
    I ride bicycles sometimes
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    Anytime Scar. Thanks for the great DIY!

  4. #4
    mtbr member
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    A carbon fiber version sure would match your bike set up nicely!!

    Next time!
    Wrecker of fine things

  5. #5
    I ride bicycles sometimes
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    Quote Originally Posted by 02Slayer
    A carbon fiber version sure would match your bike set up nicely!!

    Next time!

    hahaha

  6. #6
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    Right on! And ride on!

  7. #7
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    Are you having any heat issues with this build? Thinking of doing one of these, found a 400 lumen triple bulb from LED Liquidators that I'm considering.

  8. #8
    I ride bicycles sometimes
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    Absolutely NO heat whats so ever. Ive put some miles and hours on this light and it works perfect. As for charging, i got a smart charger that charges 14.4v packs so i can charge the whole thing as one instead of charging the batts separate. MUCH better. Batteries last for well over 3 hours.

  9. #9
    Doesntplaywellwithmorons!
    Reputation: DeeEight's Avatar
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    I'm using the same bulbs, three Cree XR-E 2watts in the housing. I don't have a front glass cover on mine though so they're not totally waterproof since the LED bulbs I get have thin vents in the front face. 400 lumens claimed, and I'm running a 15 spot next to another with the 45 flood. The flood has no hot spot or weak spillage at all. The guy I buy the bulbs from locally claims he's getting a new MR11 size bulb soon with three 1W XR-Es in the same housing. Should be good for a couple hundred lumens.

    its basically my pooplight 16 assembly with a switch from the halogen to led bulbs.

    <img src="https://yoda.densan.ca/kmr/bikes/pooplight16parts.jpg">
    <img src="https://yoda.densan.ca/kmr/bikes/pooplight16parts2.jpg">

    The operating temperature of the bulb in an indoor track-lighting setup is given as 70C, and that's with negligible airflow over it which is really quite low. They draw about 450 milliamps, and I've run as few as 9.6V to the bulb and it powers up nicely, but I usually run two 8-cell packs in series to a splitter power cord with bar-mounted remotes by each brake lever for the dual beams.
    I don't post to generate business for myself or make like I'm better than sliced bread

  10. #10
    It's all ball bearings
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    Cool- Thanks for the info- I built a halogen setup using a maglight housing last year, it worked good with a mr16 halogen, but was power hungry. I bet it will be better with this bulb

  11. #11
    Doesntplaywellwithmorons!
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    I had a short-out tonight, i'm not sure if its the voltage of my pack being too high or if a wire crossed someplace or i had a bad cell. I'm gonna be diagnosing in a bit as soon as i eat a loaf of bread. While they were both operating though, in a light drizzle and super-technical singletrack, the pair provided good light to ride with, but I'd call the 45 pattern one only adequate on its own as a commuter / fireroad climb light. In the woods and weaving past trees, I wanted something else with it. The 15 on its own provides good light, and a pair of them will probably work out better.


    edit : and the winner is... both the 8-cell battery holders had bad springs. In one, 7 of the negative-contact springs holding the batteries against the positive contact fatigued and compressed so far as to break the contact. Brand new battery holders tooo. Mucho annoying.
    Last edited by DeeEight; 10-28-2009 at 07:34 PM.
    I don't post to generate business for myself or make like I'm better than sliced bread

  12. #12
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    Quote Originally Posted by DeeEight
    edit : and the winner is... both the 8-cell battery holders had bad springs. In one, 7 of the negative-contact springs holding the batteries against the positive contact fatigued and compressed so far as to break the contact. Brand new battery holders tooo. Mucho annoying.
    I've had that same problem with battery springs on the same holders a couple of times.
    It is a pain; I soldered all the spring bases to heavier wire where I needed to (using flux it happens quickly; not as much heat input to the spring).

    Still have one dodgy one though. Doing a continuity test on the spring shows poor conductivity.

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