It is hard to know what you are doing but an LED with only 0.48mA through it would be very dim indeed. So no your measurements on the face of it do not sound reasonable.When you measure 20mA through the LED, is there a resistor and what voltage are you applying to it?What sort of meter do you have?Does it have a battery and is it in good condition?
when measuring 20mA, there is no resistor and voltage applied is around 2V.
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