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  1. C

    Help with heatsinking calc for a Cree Q5

    Oh yeah, thanks VidPro for your essay... didn't really understand a lot of it :-) but got the general idea you just trial/error it.
  2. C

    Help with heatsinking calc for a Cree Q5

    Thanks modamag, for the offer. I've sketched a rough drawing so you can get the idea. The Q5's and optics are behind a glass cover on each pod, and the pods are bolted to the heatsink with thermal goop inbetween. I added a heatsink as a "backbone" to the whole thing, but obviously the length of...
  3. C

    Help with heatsinking calc for a Cree Q5

    As always, this is turning into something a bit more complicated than I hoped... anyway, I'm making my way through this document, which seems to describe heatsink theory in relatively simple words... http://sound.westhost.com/heatsinks.htm
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    Help with heatsinking calc for a Cree Q5

    Hi, I'm designing a 6x Cree Q5 mountain bike light, and wondering what I can get away with in terms of heatsinking. Obviously its important when driving these at 1A, but weight is an issue. My design is 6 individual aluminium pods, like a section of pipe with one end closed, and the cree star...
  5. C

    Need help understanding LED optics

    Thanks Yellow, thats a mean idea! Adds a bit more complexity to the construction, but as you say, would be much more efficient than using eliptical optics to acheive a East-West spread beam. The design I'm tending towards (with weight and cent of grav in mind, as this is a helmet mount) is 6...
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    Need help understanding LED optics

    Yeah, I agree about the p7 (or MC-E) being less hassle, but I'm kinda committed to using Q5's unfortunately (bought them a while back when the NZ$ was strong against the USD, and now have a lot of optics to test.) Anyway, you gotta draw a line in the sand, as these things will always change by...
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    Need help understanding LED optics

    Thanks LukeA. Yeah, I realise that now... after reading this http://www.ekspoled.lt/files/File/Designing%20with%20lenses%20and%20secondary%20optics.pdf Last night, I jammed the clear optic (no holder) down over the metal ring of the cree (fit almost perfectly, hence I thought it was meant to...
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    Need help understanding LED optics

    Hi, I'm new to this forum, so first up HI to everyone. I'm in the process of designing a homemade mountain bike light, using 6 cree Q5's, a MaxFlex controller, and some optics sourced from DealExtreme. It was hard finding optics which were spec'd for the right mix of flood and spot I...

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