![]() The purists will note that these LEDs really are meant to be run at 20mA. ![]() In fact, if you can simply hold a 200 ohm resistor in parallel with one of the resistors (100 in parallel with 200 gives 66 2/3 ohms) to see if it makes much of a difference. I'd suggest you try doing one first to see if you think it's worth the effort. However, because the human eye is logarithmic in it's response, you will probably only perceive it as being a little brighter. That is: (5V-3V)/.03A = 66 2/3 ohms There nearest standard value is 68 ohms. But if you want to take full advantage of the available current, you want to up this to 30mA. If you don't change the resistors, this would give a current of 20mA. 03A = 30mA White LEDs typically drop about 3V. (Should be marked brown-black-brown if I'm correct.) Assuming a 5V supply, and a forward voltage drop of about 2V for the red LEDs, that gives a current of: (5V-2V)/100 ohms =. If memory serves (I lent out all of my X4's), the resistors are 100 ohms each.
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