Change colors, upgrade or service lightbar in the field. Simply remove four screws to access any section of the lightbar. Replace any lighthead by removing one screw and single connector. This Whelen light bar is built with Gen 3.5 Linear 6 LED modules on the corners and more economical Gen 3.5 Conical 3 modules with optical spreaders elsewhere. A center aluminum frame provides sturdy support without unnecessary bulk. Made in the USA for craftsmanship you can count on.