John: Nearly as impressive as your design is your knowledge of the different specifications and attention to using that data as part of a process around design tradeoffs. Looking under the covers and considering the pros and cons of different materials and different design choices is all part of the game and you are well on your way to becoming quite a diligent and thoughtful engineer.
Not sure whether you meant that those are better, or this is, but I did notice that they were over $600 and $1000usd respectively. This was about $50, and runs cold. Those, just judging by size, would run VERY hot, and would probably not run for the claimed ~2 hours without overheating. Either way, I wasn't claiming that this is the brightest possible light, just that it is very bright.
Beth, I agree, what a cool Gadget Freak video! John is definitely passionate about LEDs and I can see him becoming the next Thomas Edison of the 21st century. I have a couple students in my Electrical Engineering Technology program (I'm Dept. Chair) at ITT Tech want to share this video with to get them motivated about their field of study. Very Nice work John!!!
Cool invention, John, and one that I'm sure you'll get lots of fun use out of (watch your eyes everyone). But what I love most about this Gadget Freak example is that John is 15 and motivated enough to pursue his interest in engineering and science to experiment with new technologies like LED. Keep it up and let's hope there are lots more Johns out there today honing their engineering skills for tomorrow.
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Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.