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How are LED lights energy efficient?

How are LED lights energy efficient?


LED lighting with its lower power consumption and wattage, longer lifespan and low heat output, has been widely accepted as the new type of environment friendly source for illumination and decoration.

Using LED lighting can save you up to 90% energy compared with traditional fluro / cold cathode lighting sources. It does not contain detrimental materials like mercury or phosphor, and can be recycled 'cleanly'.

Less power consumption means the reduction of coal consumption therefore reducing emissions such as sulfide and carbide etc.

The key strength of LED lighting is reduced power consumption.
When designed properly, an LED circuit will approach 80% efficiency, which means 80% of the electrical energy is converted to light energy.
The remaining 20% is lost as heat energy.

Compare that with incandescent bulbs which operate at about 20% efficiency (80% of the electrical energy is lost as heat).

In real money terms, if a 100 Watt incandescent bulb is used for 1 year, with an electrical cost of 10 cents/kilowatt hour,
$88 will be spent on electricity costs. Of the $88 expense, $70 will have been used to heat the room, not light the room.

If an 80% efficient LED system had been used, the electricity cost would be $23 per year
- there would be a cost savings of $65 on electricity during the year.

Realistically the cost savings would be higher as most incandescent light bulbs blow out within a year and require replacements

whereas LED light bulbs can be used easily for a decade without burning out.