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@Gordon
15mA would seem to be fine (especially if sending short pulses of IR).
See the graph on http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fgpio.html at the bottom
Having said that, it depends what I've set the 'drive mode' to. And looking at the code it seems I have set the drive move to 'standard', so the max you could use is 5mA.
I should probably set the drive modes to high for everything, but I wonder whether anyone can think of a reason why this would be bad