UNIVERSAL INSTALL - Use these 4 foot LED tube lights with your existing fixture in any type of setup. Whether you are using an existing ballast or in a direct wire connection, these plug and play lights will work with ease. Each LED t8 bulb can be either single-end or dual-end powered and will work with standard 120 volts or 277 volts installations. Check extensive ballast list for compatibility.BRIGHT - Every LED light tube provides your 4 ft light fixtures with 1900 lumens of crisp, quality light that will brighten your space more efficiently than your standard 48 inch fluorescent tube lights, equivalent to 146 lm/W. Use these in your shop, garage, workshop, office, basement, indoor, outdoor, or anywhere in your home requiring tube light bulbs.SAVE ENERGY - Cut the cost of your energy usage by up to 59% when you use these 13 watt 4ft LED" light bulbs which are the perfect replacement to 32 watt fluorescent tubes. Save yourself time and money by making the switch to energy efficient lighting that is brighter and longer lasting.CONTINUOUS LIGHT - Built with an astounding 50,000 hours of lifetime which means no replacement will be needed for the next 45 years. Each t8 LED bulbs 4 foot lasts 3.8x longer than traditional tube lights and at a fraction of the cost.RELIABLE LIGHTING - Zero flickering light, zero delay, and zero worries with 48" t8 LED bulbs that provide high quality indoor and outdoor lighting. Each tube bulb is quick to install, damp location rated, comes UL listed and UL classified for your safety, works with magnetic and electronic ballasts, works in direct wire ballast bypass installations, is g13 2-pin base, and backed by a 5 YEAR WARRANTY.