LED strip dim and MOSFET very hot when powered through Arduino - Project Guidance - Arduino Forum

Hi, I have been using the following setup to power and control 12V led strip through my Arduino Uno R3: Everything was fine when I used a short strip, but now I wanted to try and control a bit longer (5m = 14.4W/m) 2 pin led strip. When I connect everything up and power on (12V, 5A source), the led strip is noticeably dimmer than it would be powered straight from the source. It's got red and blue lights mixed and there is no clear pattern, but a few leds in a row would be brighter, then like

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