Plug & Play which fits in your existing B22 holder with zero installation cost. 2.5 ft width of the product gives wider light spread. 100 lumen per watt i.e. 2500 lumen for this product gives better brightness than 20w batten. Swivel body enables you to move the product up and down up to 35 degrees for better focus. Wider body for low glare & better eye comfort. Goes well in your living room, bed room, shop front, passage etc