Requesting advice on what resistor to use with 12V LED array
Wiring LEDs in parallel without a current  limit resistor for each LED can mean that all the current is taken by the LED that has the lowest forward voltage. This can mean destruction of that LED, then the next one until they are all dead.

Assuming you do the right thing and use current limiting resistors for them all then the resistor has to drop 8.6 volts at 16mA. This is a resistor value of about 537 ohms.

However, you could wire 3 in series to produce a combined LED voltage of 10.2 volts then use a resistor of  112 ohms. It will be a more efficient way of driving the LEDs . Ten groups of three in series sounds a much better way to me.