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Fat, old, and nearly bald, Pat O'Briant bumbled his way through an aeronautical engineering degree at an enormous state university which fortunately had an open admissions policy. I've spent the last 28 years designing and building spacecraft in the DC area.

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  • pobriant commented on pobriant's instructable 36 Volt - 900 Lumen LED Stadium Lights1 month ago
    36 Volt - 900 Lumen LED Stadium Lights

    Hi Sbauer, It is pretty easy to overdrive (too high voltage plus too high current) and burn out the LEDs by over heating. Read the voltage specifications for each LED. 10 years ago virtually the only emitter (bright) LEDs available required around 3 volts. But if you wired 8 in series, then 8x3 volts = at least 24 volts. (add a little extra to account for voltage drop across each). So you could use a modified 24 volt drill battery or 2 x 12 volt batteries. But with LED suppliers now offering other prepackaged solutions like the quad star (4 in one I wrote about above) that take 12 volts, you may want to keep it simple approach and low cost with rechargeable 8 AA batteries. https://www.amazon.com/8pcs-Cells-Battery-Holder-B...

    HI Sbauer9,Sorry, for the short cut. The more standard name to search for is "quad LED emitter". As I'm sure you are aware, each standard high power power LED emitters need to be driven by a voltage source fairly close to 3 Volts. So in LEDs wired in series, each LED drops the voltage by around 3 Volts. (My original instructable, I wired the LEDs in series (and when I accounted for the not quite 36 volts the Dewalt battery delivered plus losses and found it worked best for qty 9 LEDs wired in this series arrangement). And.... these days the LED manufactures will do the series wiring for you. This is the quad LED star. 4 LEDs on one STAR, and instead of driving them at 3 volts. Below is one example of a quad star LED emitter. The specification says to use 11.6 to 13 volts....see more »HI Sbauer9,Sorry, for the short cut. The more standard name to search for is "quad LED emitter". As I'm sure you are aware, each standard high power power LED emitters need to be driven by a voltage source fairly close to 3 Volts. So in LEDs wired in series, each LED drops the voltage by around 3 Volts. (My original instructable, I wired the LEDs in series (and when I accounted for the not quite 36 volts the Dewalt battery delivered plus losses and found it worked best for qty 9 LEDs wired in this series arrangement). And.... these days the LED manufactures will do the series wiring for you. This is the quad LED star. 4 LEDs on one STAR, and instead of driving them at 3 volts. Below is one example of a quad star LED emitter. The specification says to use 11.6 to 13 volts. (Or a fairly typical 12 volt battery) http://www.luxeonstar.com/cool-white-5650K-sinkpad...

    Sure, those should work if you wire 4 in series.

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  • pobriant commented on pobriant's instructable 36 Volt - 900 Lumen LED Stadium Lights1 month ago
    36 Volt - 900 Lumen LED Stadium Lights

    Hi Sbauer9,Wow, I had not thought about this hack in several years. Well done, you found a moldy oldie here. And you absolutely nailed the right question here, LED technology have advanced tremendously. Much simpler and easier to do now. Here is how I would solve a similar problem in 2016. 1)Yes, absolutely if you have access to 110 volt AC power, plug in with a set of outdoor extension cords. 2)These clamp type plugin fixtures are a simple and low cost approach. Can you get high enough by mounting to a ladder leaning on your house, make some tall poles or maybe a have a tree you can throw a rope over clamp on to the rope? Just be safe out there. https://www.amazon.com/Bayco-SL-302B3-Brooder-Porc...3) It's now pretty hard to beat the quality and price of standard screw in LED bu...see more »Hi Sbauer9,Wow, I had not thought about this hack in several years. Well done, you found a moldy oldie here. And you absolutely nailed the right question here, LED technology have advanced tremendously. Much simpler and easier to do now. Here is how I would solve a similar problem in 2016. 1)Yes, absolutely if you have access to 110 volt AC power, plug in with a set of outdoor extension cords. 2)These clamp type plugin fixtures are a simple and low cost approach. Can you get high enough by mounting to a ladder leaning on your house, make some tall poles or maybe a have a tree you can throw a rope over clamp on to the rope? Just be safe out there. https://www.amazon.com/Bayco-SL-302B3-Brooder-Porc...3) It's now pretty hard to beat the quality and price of standard screw in LED bulbs, especially from places like Home Depot and Amazon. High efficiency, robust to damage, and fairly inexpensive.Something like these?https://www.amazon.com/Philips-455717-Equivalent-Daylight-4-Pack/dp/B00YEMKJE2/ref=sr_1_4?ie=UTF8&qid=1477454241&sr=8-4&keywords=led+bulbs+100+watt

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