Real Quick LED Driver Question

I am trying to drive an LED (2.1Vf, 20mA) from a digital signal
(3.3V). From what I have been able to understand, the logic level
output I am using does not provide enough current to drive an LED
brightly. I have another power souse (7.4V) on board to drive the
LEDs, but I do not know what transistor to use. There are so many
different ones. What would be my best option? Can someone point me
out to a model number?


Thanks,
Tom

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