Ok I think you guys wont help me if I ask like this, sorry, so let me rephrase:

In this section of circuit I need to find the correct value for this resistor, can you guys tell me if am I right:



So, from the PIC I got 5V when that pin is logically high. I know pic sources at maximum 20/25mA, thats why I got the R1 wich makes arrive just 0,5mA at the TIP122 and thats suficient for connecting my big led of 3W and the ground (cause the gain is 1000).

The led is 3W so when at 12V passes through him 250mA. And thats exactly what I got. According to the datasheet its collector nominal current is 5A (and all Leds current summed is just 2A, so it could hold the whole circuit by himself, wich is pretty good :P but its not gonna happen).

Now my big trouble: When I added that seccond resistor trying to send all that EMI to the ground (what worked pretty well), the current sent by the PIC isnt the same anymore. So if this 2nd resistor is also 10K PIC should send him 0,5mA too, so he would send 0,5+0,5 = 1mA is that right???

Theres anything else that shall I worry about? Plz help!
If thats all and correct I finally understood how to find a pull down resistor :P

Thanks!