The HLG 185h is a 200w driver so running 4 1818s @1050mA would make 213watts of power, so you would be over the available power. I think at that current the fv is 50.8 volts per cob so you would have 203.2volts which is also over the voltage on that driver.
You could run 3 cobs at that current on that driver. Or change to the c700 and run 4 at that lower current... Maybe there are better options though, That doesn't seem like a lot of light.
Have a look at the 1212 which are $13 ish, I don't think northerngrowlights do the 1212s but
@CobKits does I believe.
Not saying one chip is better than the other but its good to have options. More of a lower voltage chip you could get away with a smaller heat sink or you could bump up to 6 of those 1818s on 2 drivers and have a really good PPFD in your 3x3