3 COLOR OPTIONS - Not able to decide which color you want in your space? Each t8 LED light tube has an adjustable color switch attached which can be used to change between 3 cct color temperatures. Enjoy your lights at 4000K cool white, 5000K bright white, or 6500K daylight. Feel free to adjust your lights further by taking advantage of the dimming feature when using a dimming capable ballast.PLUG PLAY - Use these as a direct replacement to your existing fluorescent tube lights that make use of the ballast already in your ceiling fixture. These 48inch LED bulbs are compatible with an extensive list of ballasts so you can just install these without making any adjustment. No need to change your shunted lamp holders or tombstones. Check ballast list for compatibility.BALLAST BYPASS - Not using a ballast? Feel free to hardwire these directly since these can handle single end or dual end powered connections. Capable of both 120V and 277V wiring installations and can work with existing shunted lamp holders/tombstones when dual end connected. If using a single end install, you will need to use non-shunted lamp holders/tombstones.CONTINUOUS LIGHT - Built with an astounding 50,000 hours of lifetime which means no replacement will be needed for the next 45 years, based on 3 hrs/day use. Each t8 LED bulbs 4 foot has a transparent cover and is shatterproof which allows for safer installation compared to glass fluorescent lights. Use these in your shop, garage, workshop, office, basement, indoor, outdoor, or anywhere in your home requiring t8 LED lamps.RELIABLE LIGHTING - Zero flickering light, zero delay, and zero worries with 4" tube light bulbs that provide high quality indoor and outdoor lighting. Each LED tube lights is quick to install, has a 3cct tunable switch, damp location rated, comes UL listed and UL classified for your safety, works in direct wire ballast bypass single or double end installations, existing ballast fixtures, is g13 2-pin base, and backed by a 5 YEAR WARRANTY.