4Ft LED T8 Emergency Tube Light, 18W, 2200Lm, 4000K, Emergency Power 8W, 100-277VAC, 20PK

Oval extruded Aluminum / polycarbonate body. Battery: 9.6V 600mAh Lithium. Type B, 2-1 tube: regular T8 LED tube + emergency function. Emergency time: 90 minutes. Battery protection: over charge protection, over discharge protection and short circuit protection. The battery meets 500 cycles of standard charge and discharge. High brightness in emergency mode. REMEMBER TO SHOP BY LUMENS, NOT WATTS. When upgrading from traditional blubs or fixtures to LED fixtures it is important to shop based on lumens, not watts. Historically consumers looked at wattage to determine how much light output lumens they were purchasing. Lumens per watt can vary based on a manufacturers product design, LED chip technology and other factors. An LED bulb consumes on average at least 50 percent less energy than CFLs and around 80 percent less than mercury. 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. The above examples are industry averages, for more detailed information on this product please refer to our spec sheet. 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. For example 60W X 140LM/W = 8400LM.