Hi guys i'm a newbie here needing some help and advice. I have a DC constant current LED driver that delivers 280mA. The input range is 12-24V DC and it gives a constant current output of 280mA. I've been told that the input range can handle the voltage fluctuations of a car which usually varies from 12v - 14v. However, when testing the driver, i realised that although the current output always delivers 280mA, the voltage output fluctates with the fluctuation of the car voltage. But because the current always remains at 280mA whether car is delivering 12v or 14v, the current seems to always be 280mA. I'm just wondering if the voltage fluctuation will in any way effect my LED's or reduce its lifespan? I was considering adding a Voltage regulator but someone recommended to use a 5W 12V Zener Diode instead which will block anything above 12v.
any help would be greatly appreciated.