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im bored so i will elaborate.
LEDs are semiconductors. This means that they have a negative temperature coefficient for resistance. The hotter it gets, the lower the resistance gets and so more current flows which in turn means MOAR heat.
so its always advised to have a resistance in series with the LED.
if 'V' is the voltage of your source.
'v' the voltage rating of your LEDs
'i' the current that should flow through the LED
and R the resistance required...
V - v = i R
or R=((V-v)/i
nice. i keep it.