No, 210 watts won't give you the output of 1,000 watts.
However, if LEDs are 60% efficient and HID is 30% efficient, you will still be putting out more light per watt with LEDs and wasting more of your energy as heat with HIDs.
Two other factors come into play...
LEDs usually concentrate their light into the red and blue parts of the spectrum, and these parts of the spectrum are used more effectively by plants. HID lights "waste" some of their power by putting light into yellow/orange/green parts of the spectrum, and plants aren't good at using these colors of light.
LEDs are more directional. HID fixtures output light in every direction. The reflectors aren't 100% effective, so some of this light is lost. Some of this reflected light hits the bulb again, and is lost. Also, the reflected light has to travel farther, so loses intensity.
Anyway, I would guess that a 210 watt LED could put out as much usable light as a 600 watt HID, but would fall short of a 1,000 watt HID.