Light emitting diodes are diodes which means they pass electronic components that let electricity pass in only one direction. They emit visible light when electricity is applied, much like a light bulb. When many LEDs are side-by-side, they can create pictures, such as the scrolling red LED signs found everywhere. LED light bulbs are becoming increasingly popular with designers and consumers of green technology, as they use less electricity, last longer, and emit more light on a pound-for-pound basis than traditional incandescent bulbs. However, while it may be tempting to look at them as having solved the problem of environmentally-unfriendly lighting. Traffic signal lights, and automobile head and brake lights, allowed residue to leach from them, and then analyzed its chemical content. They discovered that low-intensity red LED light bulbs contained up to eight times the amount of lead allowed under California law, although generally brighter LED light bulbs tended to contain the most contaminants. While white LED light bulbs had a lower lead content than their colored counterparts, they still had high levels of nickel. They emit visible light when electricity is applied, much like a light bulb. They may be pricey but they are worth it in the end.
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