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The LED lamp market is projected to grow from US$75.8 billion in 2020 to US$160 billion in 2026. [9] LEDs come to full brightness immediately with no warm-up delay. Frequent switching on and off does not reduce life expectancy as with fluorescent lighting. [10] Light output decreases gradually over the lifetime of the LED.
However, many lighting designers have pointed out that a 30% loss of light is pretty poor performance and some manufacturers have responded by providing L80, and even L90, data (that is, the life until the LED has lost 10% of its initial brightness). [5] There are a number of methods for controlling lumen maintenance areas:
Life expectancy for many types of lamp is defined as the number of hours of operation at which 50% of them fail, that is the median life of the lamps. Production tolerances as low as 1% can create a variance of 25% in lamp life, so in general some lamps will fail well before the rated life expectancy, and some will last much longer.
Meanwhile, high-pressure sodium vapor lamps cost only $44 a year to operate, with a standard life expectancy of 15,000 hours, which also helped to lower labor and maintenance costs. [1] According to the Edison Tech Center, sodium vapor lamps are "the most ubiquitous lamp for street lighting on the planet." [17]
The life span of an LED as compared to other light sources [2]. The primary appeal of LED street lighting is energy efficiency compared to conventional street lighting fixture technologies such as high pressure sodium (HPS) and metal halide (MH).
The world's longest-lasting light bulb is the Centennial Light located at 4550 East Avenue, Livermore, California. It is maintained by the Livermore-Pleasanton Fire Department . The fire department claims that the bulb is at least 124 years old, having been installed in 1901, and has only been turned off a handful of times.
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