Agreed. Move-on with a more robust solution. From your hand-drawn schematic, replace 'gate' with base, 'drain' with collector, and 'source' with emitter. Since you will be using NPN transistors, you will need to limit the base-current to about 1/50 of the maximum LED current with a series resistor (where you show a diode). If your LED is 50mA or less, then a 2.2K base resistor is about right. (Let me know if you need help calculating exact value if you are trying to minimize power consumption). The resistor from gate-to-source (base to emitter) is not needed. Just about any NPN transistor will work; 2n3904 is perfect and dirt-cheap. Be sure to check the pinout; I've seen variations that may not be pinout-compatible with the MOSFET.
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