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devilshaircut asked Can I use 6 volt lead acid battery on an LED lantern that says 4.5 Volts supply?
I tried plugging a 6 volt power supply adapter in it and it works fine. I also tried using 3 Volts and got the same amount of brightness. The main point actually is does it affect the useful life of LED under those circumstances? I am actually considering putting another lantern in series to dilute the the voltage but I just want to know whether LED can still work best on higher or lower voltage.
And got the following answer:
A simple LED circuit consists of a power source (battery), the LED and some type of current-limiting device (like resistor or internal resistance of the battery). A single red LED generally drops between 1.7-2.2V at 20mA current. A single white LED generally drops between 3.1-3.8V at 20mA current. The datasheet shows that the intensity of the LED varies nearly linearly with the current going through the device. So, as the battery voltage changes with a "SIMPLE" LED circuit, the intensity will definitely change. Some flashlights use multiple LEDs in series with a common resistor and a higher battery voltage. These are still "Simple" circuits. The resistor controls the amount of current which flows through the LEDs. A lot of power is lost in the current limiting resistor, reducing the efficiency and battery life. More expensive, higher tech flashlights use electronic switching-type regulators. These devices are much more efficient and can apply the same output current over a wide range of input voltages; what you would find with the batteries the light specifies... even as the battery gets weak and the voltage drops. That is why the light is the same brightness over a wide input voltage range. These switching regulators work great when the battery voltage is low. But these circuits are only rated up to a maximum input voltage. Exceed that voltage and you can permanently destroy the circuit.. and the light. I would avoid exceeding the recommended battery or AC adapter voltage by more than 15%. Doing so would increase your chances of destroying the light.