You can totally have to much light. That also doesn't look anything like my Mars TS1000s, maybe they updated? I run 2 Mars TS1000 for a 4x4 space, and without CO2 supplementation they are fine at 400-500umol over a 18 hour day.
Be careful with "advertised" wattage, a TS1000 is not a 1000w light, it is a 150w light.