Well, i finished my studies but have continued along with my love of electronics. But, i have come across a problem. I have four 1.5V batteries in series, thus producing 6 volts. this is to power 4 blue LED's in paralell. The problem being the max volatage of the LED's is 4 volts (3.5 is best). So, first i need to drop the voltage given to the LED's from 6v to 3.5v. A resiter in series would do this right? each led is 130mW at 4 volts, so thats 30mA So my question is how do i supply the 4 leds in paralell with 3.5? please show your working so i can learn how to do it.