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How is estimated service life determined?

Last Updated: Jan 06, 2017 02:19PM EST
To determine the estimated service life on medium-based general service bulbs, the FTC has developed a "Lighting Facts Label.” The estimated service life and energy savings noted on these labels are based on average residential use of 3 hours per day. In accordance with these guidelines, our residential warranty is also based on 3 hours per day. To learn more about our warranty policy, please click here.

As it relates to GU24 base light bulbs, the FTC does not require the label; however, Satco uses the same methodology as the medium-based bulb for the warranty of GU24 base bulbs.

Remember, average rated life is a measure of the median time in hours that it takes for a light bulb to burn out. This is the point in laboratory testing where half the test bulbs have burned out and half the test bulbs are still burning. For example, a 60-watt A-19 incandescent bulb may have an ARL of 8,000 hours. However, not all bulbs of this type will last exactly that long. There are also several application and environmental factors that could affect the average rated life of a bulb.

Factors That Could Affect a Bulb’s Estimated Service Life
    1.    Dimmer, dusk-to-dawn or occupancy sensors
    2.    Ambient temperatures (heat and cold)
    3.    Vibration or rough service
    4.    Fluctuations in voltage
    5.    Improper ventilation or air flow (heat disbursement)
    6.    Bulb position (base up or down)
    7.    Enclosed fixture

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