DIY: Playing with LED lights

The term "led lights" brings up a mix of results on Google. Then the questions arise: do I mean those stick on lights/lamps, or those small electronic components, or string lights, and how do I get the search results I want? Best answer: keep trying until you see something useful.

With the idea of using LED lights for projects, maybe Christmas projects, I found 3 different approaches.

First, there's sparkleballs using strings lights, plastic cups, and zip ties. You can find some instructions at instructables.

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Sparkleballs, instructables

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Another approach is to buy ready-made single LED lights, often called stick on, and devise new ways to use them. For an example of a not-a-string light project, take a look at Loew Cornell's LED lantern. Loew Cornell has a line of mason jar, aka Ball jar, craft items call Transform Mason. You can find some at Jo-Ann and Amazon.

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LED lantern project, Loew-Cornell

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Another approach is wiring LEDs. This can get complicated, so here's a progression of articles on working with LEDs. From eHow there's How to Design a Simple LED Circuit. ElectroSchematics has a wealth of LED projects and circuits. Instructables has a section on LEDs. I've bought LEDs from Super Bright LEDs and they're good to deal with; they have a section on LED Lights For Artistic Projects.

Because I got fixated on finding a good LED-music sync project, here are 3 that look interesting, all from instructables: How to Make an LED Ambient Mood Light: A Beginner Tutorial, Arduino RGB LED Music Lights, and Beat Sync (fairly complex).

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elevenbytes, LED mood light, instructables

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Thanks to Brit & Co for some leads on LED projects.


-- Marge

So what's so special about a blue LED?

Steve Woodward, Child studying by solar light, ABC.net.au

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One of this year's Nobel prizes was awarded to the Japanese inventors of the blue light-emitting diode (LED). NobelPrize.org explains that

by using blue LEDs, white light can be created in a new way. With the advent of LED lamps we now have more long-lasting and more efficient alternatives to older light sources.

Popular Science asked the same question I did--"Why A Blue LED Is Worth A Nobel Prize"--and went on to say:

LEDs are basically semiconductors that have been built so they emit light when they're activated. Different chemicals give different LEDs their colors. Engineers made the first LEDs in the 1950s and 60s. Early iterations included laser-emitting devices that worked only when bathed in liquid nitrogen. At the time, scientists developed LEDs that emitted everything from infrared light to green light… but they couldn't quite get to blue. That required chemicals, including carefully-created crystals, that they weren't yet able to make in the lab.

Once they did figure it out, however, the results were remarkable. A modern white LED lightblub converts more than 50 percent of the electricity it uses into light. Compare that to the 4 percent conversion rate for incandescent bulbs, and you have one efficient bulb. Besides saving money and electricity for all users, white LEDs' efficiency makes them appealing for getting lighting to folks living in regions without electricity supply. A solar installation can charge an LED lamp to last a long time, allowing kids to do homework at night and small businesses to continue working after dark.

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LEDs! 

PiccoloNamek on Wikimedia Commons, CC BY-SA 3.0

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This NPR blog, Goats and Soda, calls LED lights a 'transformative technology' in the developing world, replacing kerosene with solar power. Lighting Global supports a burgeoning market for off-grid lighting.

Problem solved...mostly.

But what about the times and places when and where the sun doesn't shine so much? Researchers are working on it: "Artificial Photosynthesis: Saving Solar Energy for a Rainy Day." If you're interested in the topic of photovoltaics, you can sign up at The Optical Society (OSA) to get current and reliable information.

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Artificial photosynthesis graphic, OSA

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-- Marge