When upgrading from traditional blubs or fixtures to LED fixtures it is important to shop based on lumens, not watts. Ideal for warehouses, factories, garage, parking lots and more.An LED bulb consumes on average at least 50 percent less energy than CFLs and around 80 percent less than mercury. To calculate the lumens output on a blub or fixture you can multiple the Wattage W X Lumens Per Watt LM/W to get the Lumens LM.