As the compact florescent light bulb has began to rapidly replace the aging incandescent light bulb in recent years, a new sort of bulb is emerging which will replace them both. The light emitting diode (LED) bulb has advantages that make it a better technology.

Whereas the incandescent bulb produces light inside a vacuum and the compact florescent bulb does so in a tube, the LED is referred to as solid-state lighting. It is solid state because 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 from the negative element to move through. When an electric charge is applied to the semiconductor, a flow 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 only utilize roughly one tenth as much electricity as traditional bulbs and thus offer big savings in power expenses as well as a decreased carbon footprint. This makes them both cost effective and environmentally friendly.

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

Since they attain their full brightness nearly immediately and are actually mercury free, LEDs solve two major issues that compact fluorescent bulbs have (mercury content and lag time in reaching total brightness).

LED light bulbs are built to emit a very directional light so the light could be aimed exactly where it is needed. Also, their light is nearer to the color of daylight, which research indicate helps people keep alert.

Until recent changes in the technology, the construction of the LED caused much of the light to be trapped inside. This and the bluish light they typically emitted brought on a dimmer light that made LEDs unattractive for home usage.

LEDs are now a lot brighter though and can emit exactly 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 really 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 costs come more consistent with other kinds of bulbs. Although their prices are coming down, LED light bulbs are still relatively costly.

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

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