I have a project in mind using an RGB LED (here: http://amzn.com/B007RO9X82).
I would like it to be powered by USB. Since the LED is rated at 3.0-3.6V, I understand I'd need a resistor. What resistor would I need and would it throw much/any heat in this situation? The feed wiring and resistor would be enclosed in a hole drilled in a wood plaque...don't want to create a fire hazard.
USB Power specs from WikiPedia: [5.00±0.25 V (pre-3.0); 5.00+0.25-0.55 V (USB 3.0) Max. current 0.5-0.9 A (general)] what resistor would I need? I assume if I sized the resistor for standard USB and it were to be plugged into a charge port (5A), that would cause trouble, correct?