I'm having the following schematics connected to a 5V 25A DC power supply. All LEDs are 3W RGB, additional values are. R1: 6.8 ohms 1/2W R2: 4,7 ohms 1/2W R3: 4,7 ohms 1/2W
I'm using an Arduino Mini and TIP120 to control each channel (R, G, and B). The 10 leds are connected in parallel, and they actually emit light (which is quite important).
During testing, and connecting a single led, this led was drawing about 0.4A for the Red channel. Now I have connected the 10 LEDs in parallel, the Red channel is only drawing 0.8A. I tried placing a resistor between pin 6 and the base of Q1, but the current drawn stays the same. The resistors tried vary between 10 ohms - 10 Kohms.
Could someone help me out? How can I direct more current through my Red channel, to make the LEDs shine brighter?
EDIT1: I've tried connecting all 10 LEDs directly to my 5V power supply. The light up all more brightfull and draw 2A in total. So I assume the problems ly in wiring up my transistors?