So a diode is pretty much helping you do a voltage divider circuit. Since they give you the current, and you know the breakdown (forward voltage), the formula is:
(Vsupply - Vforward)/current = series resistor.
With a 12 volt supply:
(12-1.7)/0.100 amps = 103 ohms <<-- this is the smallest size resistor to use
(12-1.7)/0.075 amps = 137 ohms for recommended range.
I would do a 120 ohm series resistor from your power supply.
Oh the wattage: p=v x I
So you will want to use at least a 1 watt resistor.
Of course a smaller power supply the better. Like maybe drive from a 5 volt source.