<b>Quick Facts</b> e.g. Each Fixture will cover a 9x9 ft area when installed @8-10 ft height, say you have a 20x30 ft office, (20*30)/ (9*9)= 7.40, so you might need 8 pcs of them in total to light up the space. <b>Product Specification</b> <ul> <li>2X2 40W</li> <li>5000K Daylight White</li> <li>130lm/W</li> <li>100-277 MVOLT Input</li> <li>0-10V Dimmable</li> </ul>