For a 4x4 grow tent (approx 4ft x 4ft or 1.2m x 1.2m), an LED wattage between 400 and 600 watts is generally recommended. Some specific recommendations:Vegetative Stage: 200-400 wattsFlowering Stage: 450-600 watts, ideally 480-520 wattsMore specifically, an LED grow light in the 450-600 watt range works well for flowering...