how can i reduce the voltage coming from the USB port to my LED?

i tried putting two 100 ohm resistors to my LED but it still heats up and turn to orange instead of just a green led..can't provide images because i've thrown my LED with the resistors because of my frustration...

lemonie7 years ago
Do you know what voltage the LED requires and what current? L
cons11 (author)  lemonie7 years ago
i misplaced the packaging with its ratings on it.i have a 3mm LED.
lemonie cons117 years ago
Íf it's supposed to be green/yellow, I'll guess at 1.5V 10mA. Plug that into here, and it says 390 Ohm. Sean has given a good answer, I think both of us are identifying the problem as being not enough resistance in what you were using.