Current in LED matrix

Boffin1:

According to standard calculation of current draw for a LED hooked to 5V and 220Ohm resistor, it's current it about 20mA.

As PaulRB mentions, that depends on the LED, a blue one will drop approx 3.5v , leaving 1v5 across the 2k2, = less than 1 mA through both.

Hi boffin1, I think you must have mis-read! The resistors are 220R, not 2K2, so its 10mA.