Wawa:
I think you made a (3x) thinking error.12volt RGB LED strips have three LEDs in series, so 20mA per colour for three LEDs.
Three LEDs, all white, could consume 12volt/60mA.
Leo..
Oh, actually, you're right.
Each segment of 3 LEDs draws approximately 20 milliAmperes from a 12V supply, per string of LEDs. So for each segment, there is a maximum 20mA draw from the red LEDs, 20mA draw from the green and 20mA from the blue. If you have the LED strip on full white (all LEDs lit) that would be 60mA per segment.
So that's not 60mA per each led, it's 60mA per each set of 3 rgb leds running all 3 of it's diodes per led at full brightness, which makes sense since it runs off 12v. Ok so that means it's 120 leds per strip divided by 3 which lets me know how many 3-sets there are so that's 40 sets, 60mA each running at full white brightness so = 2400mA per strip.
Alright so that's already better. 14 strips is 33,600 mA. and if I were to go from 1 strip per column to 3 strips per column then it's 100,800mA or 100,8 Amps of current for the entire thing.
Ok, that's sounds more like it. Now about making the power supply. Any reliable resources that people usually link to when it comes to learning how to build your own power supply? Even from Chinese vendors, a 100a 12v power supply is going for about 110 bucks with about 80 shipping which means that the Canadian Border is going to sodomize me for another $70 for international goods and import charges. So Screw that. I'd rather buy a thick gauge wire, some caps and diodes (which, if bought individually, don't even have taxes applied to them) would cost less and may even be used on more than one.