The working voltage of each ordinary LED white light tube (particle) is 3.3 ~ 3.6v, which is usually composed of multiple strings and parallel lighting applications. Therefore, the voltage of the LED lamp should be determined according to the actual connection of the lamp: the voltage of the parallel application is the working voltage of a single LED (about 3.3 ~ 3.6v), the series application is N LED in series, the working voltage =N×(3.3 ~ 3.6v).
Of course, there are more complex connections (such as: series-parallel hybrid circuits, etc.) and constant current source drivers and quasi-constant current source drivers are not calculated according to simple LED voltage.
Normal between 3 to 12 volts,LED lamp models of different power also have differences, common is a diameter of 5 mm silver led lamp, its power is 0.06 watts, when the voltage is large, after the connection resistance limited current, you can make the voltage in the normal power range of LED lamp work.