Works on a wide range of voltages. I tested one which started operating at 2vdc. I then increased voltage. At 16vdc it flashes faster and brighter. At 18v it becomes difficult to see the flashing. I tested to 31v. The LED appears to be solid on at 31v. I then lowered the voltage to 15v and ran it continuously for 24 hours. It worked great. The video shown is after 24 hours of continuous use on 15vdc.
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