I just got a pb4000 pro. It's 400watts good for a 4x4 tent. For best results on LED lights, look at what the light draws from the wall for wattage, not what manufacturers claim. A 700 watt light might only draw 100watts. Most cheap LED lights you will be lucky to get 1 gram per watt drawn from wall wattage. Some of the better lights will give you 2+ grams per watt. Look for Samsung diodes and meanwell drivers.