by the_ml

Tech Gadgets Mysteries, How Do LED Lights Work?

Quality lighting does not come any better than with an LED device. Whatever your lighting need, an LED device gives you quality lighting no other. The lights are colored differently and create any beautiful color scheming you want. Just buy the right LEDD light.

An LED light is a tiny light bulb that does not have a filament like the conventional light bulbs. Instead, they use a technology that allows small objects inside them to give out light. They don’t burn out therefore like the other light bulbs. These objects are efficient and can last a long time. You can fit your LED lights into a circuit easily.

Applications of LED
* Decorative Lighting
* LED Indicators
* Retail Display Lighting
* Mobile Backlighting
* Display Backlighting
* Casino Gaming

LED lights can be found in a number of devices. You can use this electronic gadget efficiently at reduced costs. These gadgets include:

Devices with LED lights
* Digital watches and clocks
* Remote controllers
* TVs such as Plasma
* Traffic lights

However, like any other gadgets, LED lights have their own limitations:
* Absorb more and there light is concentrated on one direction

When buying LED lights for your lighting needs, consider the following:

Consider
* Efficiency of the lights
* Longevity of the LEDs
* Price tags, there are expensive and affordable ones
* Color of the lights depending on your need

When in the business of selling LED lights, it is important to write about the following aspects of their working:

Write on:
* Longevity, they have no filament that burns out
* Efficiency compared to incandescent bulbs
* Durability from their small plastic bags

Solve your need for LED lighting today by buying and trying the great potential these lights have to offer. They last longer, work efficiently and consume little less energy. Your normal bulbs are incomparable to them in working and delivery. Try it out today for yourself.

Get the latest LED Lights and other tech gadgets out there today. Visit Chinavasion.com or paste this link into your browser: http://www.chinavasion.com/index.php/cName/electronic-gadgets/

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By Evan Ackerman

There are any number of potentially useful and/or incredibly stupid light-up USB accessories that owe their glowyness to various flavorings of LEDs. That’s cool, I’m down with that, I like the futuristic look as much as the next geek. But retro is rapidly becoming the new futuristic, and this USB light fits the bill neatly with a light bulb that is, in fact, a light bulb. You know, the old school vacuum + filament + heat + inefficiency + if it breaks you have to clean up really carefully or you’ll get shards of glass in your feet kind. Numerous disadvantages aside, the one redeeming factor if incandescent bulbs is present in this USB powered version… Namely, the ability to cast a warm and pleasing glow, which (I imagine) provides a nice counterpoint to the inevitably harsh and unyielding photons that are being pumped out by whatever device this little lamp is plugged into.

For about $14, you get the lamp plus two spare bulbs, one of them frosted (if you’re into that kind of thing). Each bulb should last about 300 hours, giving you decades (well, 0.01 decade) of pleasing illumination, and a replacement set of three is only about $6. It all can be yours, from where else but Japan.

[ JTT (Translated) ] VIA [ New Launches ]

LED-backlit LCDs are where TV’s future and present meet—they’re the best LCDs you’ve ever seen, but they’re not as stunning as OLED displays, which will one day dominate all. They’re not cheap, but they’re not ludicrous either. Most importantly, they’re actually here.

I’ll CC You in the FL
With LCDs, it’s all about the backlighting. This defines contrast, brightness and other performance metrics. When you watch plasma TVs, OLED TVs or even old tube TVs, there’s light emanating from each pixel like it was a teeny tiny bulb. Not so with LCD—when you watch traditional LCD TV, you’re basically staring at one big lightbulb with a gel screen in front of it.

The typical old-school LCD backlighting tech is CCFL—a cold cathode fluorescent lamp—which is an array of the same kind of lights that make people’s lives miserable in offices around the world. The reason they aren’t the greatest as backlights for TV watching is that they light up the whole damn display. Because LCD is just a massive screen of tiny doors that open and close, light inevitably leaks through the closed doors, when they’re trying to show black, resulting in more of a glowy charcoal. Check out this shot from Home Theater mag to see what I mean:

LEDs (light emitting diodes) are different from say, an old school incandescent bulb, which heats up a filament to generate light, in that they’re electroluminescent—electricity passes through a semiconductor and the movement of the electrons just lights it up. Instead of having one lightbulb in the bottom of the screen, shining up through all of the LCD pixels, you can have arrays of LEDs that shine through smaller portions of the LCD screen, leaving other portions in the dark, so to speak.

OLED—”organic light emitting diode”—is slightly different. Since the electroluminescent component is organic and not a chip, each point of light can be much tinier. That’s why an LED TV still needs the LCD screen in front: there’s no way to have a single LED per pixel unless the screen is huge, and mounted to the side of a building in Times Square. OLEDs don’t: HD OLED displays are made up of red, green and blue dots, no LCD panel required.

LED Is As LED Does
So, Samsung’s term “LED TV” is more accurately—and more commonly—described as an LED-backlit LCD. But not all LED displays are created equal.

There are two major kinds of LED backlighting: Edge-lit and local dimming. Edge-lit displays are what they sound like—the LEDs are arranged in strips running along all four edges of the TV, like you can see in this gut shot from Cnet. A light guide directs the glowyness toward the center of the screen. The advantage of edge-lit displays is that they can get incredibly thin, are 40 percent more power-efficient than regular LCDs and are a bit cheaper than local-dimming TVs. But because they’re still shooting light indiscriminately across the LCD panel, they can’t pull off the black levels that a local dimming backlight setup can.

LED backlighting of the local dimming variety is how you build the best LCD TV in the world. It’s called local dimming, as you probably guessed, because there are a bunch of LED bulbs—hundreds in the Sony XBR8—arranged in a grid behind the screen. They can all be dark or brightly lit, or they can turn off individually or in clusters, making for the actual Dark Knight, rather than the Grayish Knight you’d see on many cheaper CCFL LCDs. Sets with local dimming are pricier than edge-lit—the Samsung’s local-dimming 46-incher started at $3,500, versus $2800 for one of their edge-lit models. They are thicker too.

What Color Is Your LED?
The color of the LEDs matters too, separating the best LED-backlit LCDs from the the merely great. Most LED sets just use white bulbs. The reason Sony’s XBR8 started out at $5,000—as much as Pioneer’s king-of-TVs Kuro—is because it uses tri-color LEDs in an RGB array. In each cluster, there are two green bulbs next to one red and one blue (greens aren’t as bright). The result is high contrast plus super clean, incredibly accurate color.

LED displays are getting cheaper, more quickly than originally expected, so we could see them go mainstream sooner. You already see the lower-end edge-lit LED tech used in mainstream stuff—MacBook Pro and Dell’s Mini 9 to name a couple. Which is a good thing, since the prophesied ascendancy of OLED in 2009 completely failed to happen. So we’ll have to make do with LED in the meantime. Just be sure to find out what kind when you’re buying.