These are small crystal sync generators from 1000 watt to 6500 watt. A 2000 watt will fire a 1200 HMI watt par light, a 3000 watt fill fire a 1800 watt HMI par light, and a 6500 watt will fire a 4K HMI par light. Always leave at least 500 to 800 watt threshold because HMI’s take more wattage when starting up.