beaker wrote: ↑Thu Apr 18, 2019 9:07 am That is wrong LEDs are voltage sensitive.
Unlike typical low-voltage lighting products, getting the voltage slightly wrong in an LED-based system is a bigger problem for the LED. Because LEDs are extremely sensitive to under- or over-voltage.

With many of the early LEDs you are right.

These lit up at 7 volts.

Manufacturers are now making them to work with a range of voltages. They may be used in different applications. They also work with power fluctuations, or when the battery is going flat.

Many 12 volt LED lights are officially rated to work from 10 to 30 volts. They can be used on 12 or 24 volts, with allowance for higher and lower voltages.

You could run them on 24 volts, knowing they will still work when the battery voltage drops.

I would not run them above 30 volts, in case they melt. I would not be concerned about running them below 10 volts if they continue to work. Obviously not all brands are the same. I mentioned one brand I used worked at 7 volts.

The same has happened with laptop computer power supplies. You used to need one power supply for 110 volt countries, and another for 240 volt countries. Most of them are now rated from about 80 volts to about 280 volts, so the same power supply works anywhere in the world.

They even work when you get a voltage drop in Cambodia.