Is it possible to calculate what is the voltage need for and LED that is in a christmas light set?

It says that its 120 volt and 0,5 A but there are 2 resitors on each end of the set of light and there are a couple more solder to some LED(like 2-3..), but these resistors are not all the same...So is it possible to calculate to power require to light an LED in my set without burning it ? Thank you!?

UziMonkey8 years ago
LEDs of the same color generally require the same voltage. What color are the LEDs?
Patented (author)  UziMonkey8 years ago
1 set of Green and another one of Red (The LEDs are very small)