Pray read the third paragraph of my reply :) It specifically mentions a way to make the LED be lit for long enough.

Which is not an adjustable method -- without changing the hardware design later in production to just tweak a delay -- and surely causes the LED to slowly fade out?

	▲	GTP 8 months ago \| parent \| next [-]
		Would it be so important to be able to tweak the duration later? And why would it be a problem to have the LED fade out?
	▲	neop1x 8 months ago \| parent \| prev [-]
		If fade out is such a big problem (which it isn't IMO) there are cheap regulator ICs which can provide constant current.