LED Buffer Circuit

I need help designing a circuit, it will be a tachometer calibrator.
It will input 5V square wave signals from a Fluke 741B, nothing higher
than 3kHz & it can't draw much current from the input. It will have a
high intensity LED and a battery pack, something along the lines of 4
D Cells. The LED I have has a VF of 3.1V with a current draw of .2A
(no P/N on this guy, just found it in my drawer). Is something as
simple as a Darlington pair & voltage regulator sufficient for this,
say a 2N3904 feeding a TIP31? Is a common emitter or common collector
configuration better suited for this application? I have a very hard
time designing circuits, I'm just looking for a little guidance.

Thanks for the time,
Steve
.

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