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 Because the built-in power supply, heat is added to the tube, assume that the power efficiency is 88%, so there is 2.4W heat to disperse, equivalent to 30% and increase the heat, that is to say the power a total of 10.4W cannot be out. A difficult, which makes the LED heat added or say, making the use of LED life also more shortened. Moreover, the power of the lamp tube length length of approximately 1/5, issued by the power of the heat is concentrated in this paragraph, so near the power supply of these LED more hot baking, so life is better than in other parts of the LED is shorter, the lamp in the damaged, near the power supply a first black out. Can think, life will not LED fluorescent lamp with built-in power higher than 10000 hours.