Since the compact florescent light bulb has started to quickly replace the aging incandescent light bulb in recent years, a brand new type of bulb is emerging that will replace them both. The light emitting diode (LED) bulb has advantages that make it a better technology.

Whereas the incandescent bulb generates light in a vacuum and the compact florescent bulb does so inside a tube, the LED is referred to as solid-state lighting. It is solid state as it uses solid matter, a semiconductor, to generate light.

The semiconductor consists of both a positively and negatively charged element. The positive layer has little openings for the free electrons coming from the negative component to cross through. When an electric charge is applied to the semiconductor, a stream of excited electrons passing through the holes emits a light.

The 2 great benefits of LED light bulbs are their very long life and energy efficiency. They just use roughly one tenth as much electricity as conventional bulbs and thus offer enormous savings in power expenses and a reduced carbon footprint. This actually makes them both cost effective and environmentally friendly.

Their solid state construction and very low heat emissions give them a much longer lifespan. LED light bulbs drastically outlive even compact florescent bulbs and could easily last for a decade or longer in regular use. This not only saves on the cost of the bulb, but it also saves time and replacement costs. Much better suited to survive rough handling and out of doors conditions, a LED light bulb can be relied on to work when required most.

Since they attain their full brightness almost instantly and are actually mercury free, LEDs solve a couple of major issues that compact fluorescent bulbs have (mercury content and lag time in reaching total brightness).

LED light bulbs are built to emit an extremely directional light so the light can be aimed precisely where it is needed. Also, their light is nearer to the color of daylight, which research indicate helps people keep alert.

Till recent changes in the technology, the structure of the LED induced much of the light to be trapped inside. This plus the bluish light they often emitted brought about a dimmer light that made LEDs unattractive for home usage.

LEDs are now a lot brighter though and could emit the same soft, white light regular bulbs do.

One disadvantage with LEDs that has not been corrected yet is cost. While their energy savings and long life mean LEDs are cost-effective and save money in the long term, they are not likely to attain mass consumer acceptance until their prices come more in line with other forms of bulbs. Although their prices are coming down, LED light bulbs are still relatively pricey.

Once their prices come down more, LEDs are more likely to become the standard and dominate lighting until a better technology appears.

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