Recent content by xiorcal

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    SSCs with High Vf. (Why??)

    Re: SSCs with High Vf. Thanks guys, I was measuring at a few different places in the circuit to start with, I had completely forgotten the potential for wiring to drop voltage. I will try Mata.'s resistor measurement trick, as I've head it somewhere else as well, but hadn't twigged that it...
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    SSCs with High Vf. (Why??)

    I got 10 SSC P4 (U-bin) SW0 emitters from DX, only I've been testing their electrical properties, and they read 3.5V@200mA (Should be around 600?), 3.3V 150mA (Should be around 400?), 2.9V 50mA (Should be around 175?) I'm unable to test higher than 200mA with the multimeter I have, it's a $10...
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    Opto and Cree from Jaycar ^.-

    Hi, I don't know if any Australians have noticed yet, but Jaycar has now got Edixeon, and Cree high-flux LEDs. I would love to think it was a response to the letter I sent them about it a month ago:whistle: (but God knows). They're a bit pricey, but I guess being local is a plus...
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    Some questions about the Shark driver

    I would like to run 2 parallel strings of 4-series Edison-Opto KLC8 (Cree chip) LEDs from the Shark. I've done the below calculations, can you please correct me on anything I have wrong, and answer the extra questions at the bottom? J1 Jumpered for LEDs External 20K pot Shark will provide...
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    Series or parallel for multiple LED's?

    Altis: I don't suppose this (which I found earlier) http://www.freepatentsonline.com/6621235.html has any resemblance to the "ring counter" method you were talking about. I don't quite get what you were on about with "If there were N of them (LEDs)then each would experience N * max-current but...
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    Series or parallel for multiple LED's?

    Oh here I go, digging up an old thread again... :ohgeez: I have read somewhere (and as indicated by posts in this thread) that connecting many LEDs in parallel is not a great idea, as the slight variations in binning of the LEDs will cause some to take more of the power than others, resulting...
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    50 Watt Emitter???

    They're claiming it's in the Edipower series, however if you take a look at the rest of the series, the efficiency decreases with greater power dissipation 5W 40lm/W 10W 40lm/W 20W 35lm/W Claim on the website is 4700lm± = 50W 94lm/W Not likely, with the specs on the other emitters. However...
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    Thermal management optimization.

    Re: Thermal management Seeing as this thread has resided on the exact topic of my question, I hope I will be forgiven for digging up an oldie... Has anyone gotten around to using heat pipes in the body of an (LED) flashlight to spread heat to the grip/body, from the head? (I am guessing this...
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    Lithium Rechargeables, how stable when being bounced around on bike?

    If you're using them in LED lights, check with AW about how high the current needs to be to kick the protection circuit in. Any direct-drive application of LEDs on Li-Ion can be dangerous. The current drops significantly, in correspondence to the voltage drop in the batteries during...
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    Would you buy these?

    Whoa, the hostility! It's a great idea when you put it together with other technologies. Can you imagine a bike-rider wearing a jacket with 50 red flashers built into it, instead of just a tail-light? Or, combine it with other technologies, and you could end up with a fantastic heat-management...
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    CREE XR-E bulbs and voltage

    Crees range from 2.8V to 3.7V within spec. They go up to 4.2V or something at 2A, but that is severe overdriving, and likely to burn them out sooner rather than later. To get 200lm out of one LED, the drive will probably fall within spec. "The item description says 4.5v to 9v" Cree LEDs don't...
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    Anyone done an LED Heat-study?

    Hi, I was wondering if anyone had done/has equipment to do a heat-generation study on either Cree or SSC LEDs. The reason I am asking is to find out what kind of configuration is best thermally speaking: Will 1SSC running at 1A generate more than three times the heat of one running at .33A...
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    SSC P4 - how many cells?

    Hey, sorry to trash your question, :ironic: but you really need to give more details when you ask things like that. Such as how high power you want to run them, and what run-time you want. AW's C cells = 3.7V nominal 3.3Ah, max 5A discharge. Watts = Amps * Volts Allowed W discharge= 5*3.7 =...
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    25180 LIRs, why not?

    Hi Silverfox, If I'm not wrong, those appear to be oddly high voltage primary cells. I was talking about LIRs, but thanks for pointing them out.
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    25180 LIRs, why not?

    Hi, Summary question: Why aren't short, fat Li-ion cells, like "25180"s made? This is really more a question for manufacturers than users, but as a lot of the users on this forum seem to have intimate knowledge I thought I would post it for discussion as well; High flux LEDs take from 3V...
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