Dual-use, extend or retract, freely adjust the light bar spacing to form different PPFD（photosynthetic photon flux density ） ,different coverage area and footprint. After being extend,the minimum coverage of 1000W is 6 by 4ft. After being extend,the minimum coverage of 730W is 4 by 4ft. The sufficient amount of light considering the wattage draw and efficacy ~1500+ umol/s per 5’x5’ area ~1100-1500 umol/s per 4’x4’ area ~600-850 umol/s per 3’x3’ area ~275-375 umol/s per 2’x2’ area The sufficent coverage PPFD for plant stage:veg:300-600umol/m2/s, flower:600-1000umol/m2/s