I'm visiting a customer on the East coast this week. While driving, I've noticed that the city opted for LED traffic signals. They come to one's attention because about 30% of the LEDs in the lights are non-functional (the green lights are quite noticable). Is there really a longevity gain by switching to LEDs?
The information presented is certainly very useful, and presented in an interesting and usable manner. But the information about heat removal is missing, it appears. Since heat is the primary challenge in LED lighting, it is important, even vital, that anyone designing LED lighting understand both the heat generation and the heat removal mechanisms. After all, the selling point of the more expensive solid state lighting systems is reliability and long life, the two things that heat limits most.
Kudos to the author for writing about a necessary and important subject. Given the fact that LEDs are about to take over in hundreds of new applications in the next ten years, ranging from automobiles to aircraft to medical equipment, a primer on this subject is badly needed.
The Beam Store from Suitable Technologies is managed by remote workers from places as diverse as New York and Sydney, Australia. Employees attend to store visitors through Beam Smart Presence Systems (SPSs) from the company. The systems combine mobility and video conferencing and allow people to communicate directly from a remote location via a screen as well as move around as if they are actually in the room.
An MIT research team has invented what they see as a solution to the need for biodegradable 3D-printable materials made from something besides petroleum-based sources: a water-based robotic additive extrusion method that makes objects from biodegradable hydrogel composites.
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