At 100 % if it is a true 600 watts then I would not get any closer. Are you sure it is a 600 watt light?
This is a typical LED scam they post them as a 600 watt light but what they mean is it will most likely replace a 600watt HPS light and it won’t. You have to look at actual wattage the driver puts out. These plants would do much better with at least 4 of these lights.the light says it’s rated for .85 amps so it can not possibly be a 600 watt light.