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.
Easy installation and maintenance. Lumens per watt can vary based on a manufacturers product design, LED chip technology and other factors. When upgrading from traditional blubs or fixtures to LED fixtures it is important to shop based on lumens, not watts. LED Flood Light 200W, 5000K, 28,000Lm, 140Lm/W, 100-277VAC, Ip66, Cri70, 70/135 Deg Beam For instance to get the same light output of 500 lumens, you can either use a 40W incandescent bulb, a 9W CFL bulb or a 6W LED bulb.