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| A typical incandescent light bulb produces a luminous output of 1350 lumens, according to the manufacturer. This value represents the overall light output from the device. The light emitting diodes within the LED tube lighting we are considering for this example produces a much lower luminous output rating, of only 15 lumens, or 1.1% of light bulb's luminous output. However, in most custom LED lighting designs, LEDs exist in arrays containing numerous LED lights. |
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Home LED Lighting Lifespan
Many people tend to believe that an home LED lighting designs will provide sufficient lighting for 100,000 hours and beyond. In most cases, this is simply not true. As the LED light ages, it will continuously loose efficiency and become noticeably dimmer. However, the custom LED home lighting still offers a much longer overall lifespan when compared with the incandescent light bulb. The light bulb's lifespan rating is 750-hours (about one month of continuous operation) according to the manufacturer. Note that the industry standard for determining LED lifespan is the point at which the LED lights have reached 50% of their luminous output. The home LED lighting can operate for approximately 40,000 hours (4.5 years of continuous operation) before reaching 50% of its initial luminous output. By the time the light bulb has reached the end of its life expectancy, the LED will continue to provide nearly 100% of its original luminous output. It is apparent that the LED can survive more than 50 times longer than a typical incandescent light bulb.
Energy Efficiency
Our incandescent bulb's power rating is 100 watts. To calculate for energy efficiency we divide the luminous output 1350 lumens, by this power rating and get 13.5 lumens per watt. Since one watt only produces a luminous output equal to 13.5 lumens, we can conclude that a large portion of wasted energy escapes in the form of heat. Our LED lights power rating is 525mW (0.525 watt). This value is equal to test condition current (150mA) multiplied by the forward voltage drop of 3.5 volts. When we divide to calculate for energy efficiency, we get 28.6 lumens per watt. As you can see, the LED light will produce more than twice as much light, per watt of power. Therefore, the LED is about 2.1 times more energy efficient. |
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