Scary dev just to make clear the leds will be damaged if overvoltaged. A led marked at 1.5 volts operates normally at 1 volt goes up to 1.3 volts good diodes can handle twice the voltage for short periods but goes greenish after a while try them at just 25x voltage and they blow up (really blasts) in 1 sec or go greenish to dark. At 50x voltage instantly blasts
checked using volameter on diffrent leds flat sphere square and the ones on strips.