Because the compact florescent light bulb has started to quickly replace the aging incandescent light bulb lately, a brand new type of bulb is emerging that may replace them both. The light emitting diode (LED) bulb has features that make it a superior technology.
While the incandescent bulb makes light in a vacuum and the compact florescent bulb does so inside a tube, the LED is referred to as solid-state lighting. It's solid state because it uses solid matter, a semiconductor, to produce light.
The semiconductor is made with both a positively and negatively charged component. The positive layer has small openings for the free electrons from the negative component to go through. When an electrical charge is applied to the semiconductor, a flow of excited electrons passing through the holes emits a light.
The two excellent advantages of LED light bulbs are their long life and energy efficiency. They only use almost one tenth as much electrical energy as conventional bulbs and thus offer huge financial savings in energy costs as well as a reduced carbon footprint. This actually makes them both cost efficient and environmentally friendly.
Their solid state construction and low heat emissions give them a longer lifespan. LED light bulbs greatly outlast even compact florescent bulbs and may easily last for a decade or longer in regular use. This not just saves on the cost of the bulb, but it also saves time and replacement costs. Much better suited to survive rough handling and outdoor conditions, a LED light bulb could be relied on to work when needed most.
Since they reach their full brightness nearly instantly and are in fact mercury free, LEDs clear up two major problems that compact fluorescent bulbs have (mercury content as well as lag time in reaching full brightness).
LED light bulbs are designed to emit a really directional light so the light can be aimed precisely where it's needed. Also, their light is closer to the colour of daylight, which studies indicate helps people stay alert.
Until recent changes in the technology, the structure of the LED induced a lot of the light to be trapped inside. This and the bluish light they often emitted caused a dimmer light that made LEDs unpleasant for home use.
LEDs are now much brighter though and may emit the same soft, white light regular bulbs do.
One downside with LEDs that has not been solved yet is cost. While their energy savings and long life mean LEDs are cost-effective and save money in the long run, they're unlikely to achieve mass consumer acceptance until their costs come more in line with other sorts of bulbs. Though their prices are coming down, LED light bulbs are still relatively expensive.
As soon as their costs come down more, LEDs are likely to become the standard and dominate lighting unless a better technology appears.
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