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How Do Bulb Manufacturers Rate Bulb Life?

April 26, 2017bulb life manufacturers rate

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How Do Bulb Manufacturers Rate Bulb Life?

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Bulb life statements made by bulb manufacturers are based upon “Still Burn Life” tests. The burn test entails testing a test group. The bulbs are powered by a regulated voltage. These bulbs are allowed to burn to a certain percentage of group failure. These Still Burn Life statements are expressed as either “TC” or “B3” Life Statement. “Tc” Life Statement Tc= average still bulb burn life in hours at which 63.2% of the bulbs are still burning.