I recently purchased a Fenix PD35 850 lumen LED flashlight and it comes with a warning label that it becomes hot to the touch after running on full for a period of time. After that time period comes, the micro-circuitry powers it down to the next highest setting (and so on) in order to prevent damage. Good article on the subject.
Great discussion on the finer points of LED design considerations. Also, in addition to price drop, in many cases LED's can also offer the advantage of longer life over the other technologies that they are replacing.
I agree. This Mentor Graphics LED Thermal/Performance analysis software package would have been great to use when I was developing LED lighting fixtures while working at Hunter Fan. This data would have served as a baseline while taking actual thermal and lumen measurements using an Integrating Sphere. Management of thermal and lumen performance of LEDs is quite a challenge especially when you have to add the SMPS (switching mode power supply) LED drivers heat dissipation data using a per-square inch pcb in to the overall thermal equation. Nice article!
More often than not, with the purchase of a sports car comes the sacrifice of any sort of utility. In other words, you can forget about a large trunk, extra seats for the kids, and more importantly driving in snowy (or inclement) weather. But what if there was a vehicle that offered the best of both worlds; great handling and practicality?
Science fiction author Isaac Asimov may have the best rules for effective brainstorming and creativity. His never-before-published essay, "On Creativity," recently made it to the Web pages of MIT Technology Review.
Much has been made over the potentially dangerous flammability of lithium-ion batteries after major companies like Boeing, Sony, and Tesla have grappled with well-publicized battery fires. Researchers at Stanford University may have come up with a solution to this problem with a smart sensor for lithium-ion batteries that provides a warning if the battery is about to overheat or catch fire.
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