Recent content by CTS

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    Heat Management Issues

    I'm done debating inconsequential esoterics with you. The point here is to help people build better flashlights. We're not PhD physicists designing satellites for God's sake. I'm trying to make people aware of some basics- different metals conduct heat at different rates, often contrary to...
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    Heat Management Issues

    W/mK is a simplification. The correct expression in SI base units is m kg s-3 K-1 In this equation, time is expressed as "s"
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    Heat Management Issues

    Just briefly- Thickness, as you're referring to it is called through-plane effect. It was addressed earlier. It's pretty generally known that to get material to conduct efficiently through an interface the material should be as thin as possible. I posted a link to some research on the...
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    Heat Management Issues

    I wrote this before- I stared writing about this to stimulate some thought about how heat works in these devices. I couldn't care less about showing anyone how "smart" I am or impressing anyone. I'm an uneducated bum that does this stuff to feed his kids. It's all hands-on knowledge. From...
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    Heat Management Issues

    People are all going to understand things differently. What is clear to one might be baffling to another. All I can tell you is what works for me. The point here is this- a) there are plenty of examples of builds right here on this site that illustrate a lack of understanding of how heat...
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    Heat Management Issues

    This is a practical example of what I'm talking about- I was looking at a high-performance build a while back. Another poster was using it as an example. The light was available with either an aluminum heat sink or a copper heat sink. Being a larger light, the copper heat sink added about...
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    Heat Management Issues

    Over the years I have found that most people have a pretty good grasp of how water flows through plumbing. It's a physical process they can watch and easily visualize. I have dealt with a pretty fair number of bright, trained technical people with high levels of mechanical skill that screech...
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    Heat Management Issues

    The best simplified analogy for heat is water. I will walk through a very simplified example. Most understand what a calorie is- the amount of energy needed to increase 1ml of water 1 degree c. Or, a BTU. In our example, let's say that our LED has a nominal operating temperature of 50c. In...
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    Thermal Potting/Encapsulating Compound

    There's very little reason to pot electronics. Unless you're looking to protect the components from exposure to elements or protect unsecured components from vibration, you're probably wasting time and effort. Many believe that you can pour some magic liquid on components and have a solution...
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    Kel-Lite 7 C Cell LED Upgrade

    That's a pretty rare light. There's not going to be any sort of pre-made dropin or even someone selling LED upgrade parts. You have two possibilities- you can compare measurements and see if any existing dropins or mod parts will fit, or you can make your own. Your big issue is getting the...
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    Anodizing aluminum to mount bare emitters... why?

    One of the reasons i mentioned the MT is that it has a much larger thermal pad. This could be attached directly to a copper sink with the + and - tabs free floating while still giving you more thermal contact area than the pair of XML's. If you're going to move forward with the XML, I would...
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    looking for plans

    There are lots of things we all do every day that if done wrong can easily kill us. Like driving. You just need to be aware of some basics- like the difference between a protected and non-protected battery and what can happen if over-discharged, improperly matched, improperly charged, etc. If...
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    Newbie to Cree Looking for some advice....

    As a long time shooting hobbyist and a flashlight tinkerer I think I can understand what you want to accomplish. Unless I mistake what you're looking for, your intended purpose is a firearm-mounted light for close-quarters use. You'll notice that virtually all of the commercially available...
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    Anodizing aluminum to mount bare emitters... why?

    What I hope to do is to provide some practical insight into how heat works. For that to be helpful, I've tried to reduce it to the most basic of concepts. My thinking is that if the average builder picks up a few tips or learns more about how heat moves, they can put that information to good...
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    Anodizing aluminum to mount bare emitters... why?

    I'm by far no expert so whatever I tell you should be taken in this context. I'm learning just as many others are. In this instance some of what you're doing is coincidental to something I'm working on. The reason I suggested that you look at the MT-G2 is that I think you'll find that it's...
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