I recently bought a WS2812 LED strip (5 meters, 300 LEDs)
When the LEDs are driven at full brightness and each color lit, they draw 60mA each--or 18 amps for all 300!
This led to a problem, which led to a question.
A friend suggested that I not attempt to power the whole strip at once, because even if I could, 18 amps would probably burn it up. So, the other option is to splice in power leads every so often, which is recommended by the manufacturer.
I took a look at my power supply and realized that while it can supply between 0-24vdc, it can only supply 5 amps.
Is there no difference between 12v at 5 amps, and 5v at 5 amps other than power? I understand that Power = amps * volts, so 12v at 5 amps is 60 watts, and 5v at 5 amps is only 25 watts. My question is this: shouldn't the limiting factor be the wattage, not the current? If my power supply can supply 24v at 5 amps (it can), this is 120 watts. In order to supply 120 watts at 5 volts, I would be hitting 24 amps.