I'm going to try to build some throwies soon and am ordering some LEDs and other needed things for the task.
It is my understanding that a CR2032 battery is 2.6-3.1 volts.
Well, I have these LEDs picked out.
660 nm wavelength
1.85-2.5V Forward Voltage, at 20mA current
Would this be ok to use without any resistors? I'm ok if LED life is shortened, but I definitely don't want for the LED to just light up and then be burnt out a second later.
Here is some interesting info on throwies from evilmadscientist.com