e.g. Each light will cover 7ftx7ft area when installed at 8-10ft, If you have a 20ftx15ft garage that can park two cars, (20*15)/(7*7)=6.12，so you may need 6pcs of them to light up the whole space. Super Bright 4ft led shop lights feature 4400 lumens brightness at 5000K Daylight White by using only 42W. That is a staggering LED Efficiency of 105 lmw Excellent replacement of conventional fluorescent fixture. Energy Savings of up to 75. High Quality ETL certified for better quality, safety and reliability. This longlasting LED shop light provides up to 50,000 hours of light before any maintenance is required. Linkable 4ft linkable led shop light use plug connection to connect up to 4 pcs together in your garages, workshops, workbench areas, storage areas, warehouses, basements, equipment rooms, etc. Easy Installation Plug Play. Come with 59 power cord with onoff switch and other small accessories. You can hanging it with the included hanging chains or directly mounted to the ceiling with the included mounting screws. Hykolity Warranty All Hykolitys shop lights are confidently guaranteed for 5 years We aim for quality followed up with quality customer service directly provided by manufacturer.