LED question

[SlomoCrawlz]

sorry if this isnt the right forum to post this in guys but i need some quick advice.

i have been working on rigging on some LEDs for my Wraith. so far i have the axial universal light bucket on one string the front fogs and the rear brake lights on another string and the front headlights and turn signals on the last.

i am trying to wrap my head around and understand LED voltages and info needed to make my own simple LED controller and i feel like maybe i have been reading to much and my brain has mushed out on me.

all my LEDs are 3.5v what would be the best and most simple way to make a controller for them that will power them all correctly. obviously when i try to hook all the lines up together off the batt....only a few work. best i have so far is half run off my batt and the other half are ran off 2 9v's connected together

[KJ10]

LED Calculator - Current limiting resistor calculator for LED arrays

[BigGuyJT]

Are you wiring your LED's in series? I think thats what would happen if they are. This is the calculator I used and wired them up in parallel and they work great! LED calculator for single LEDs