Rubuta ci gaba ga wannan sakin layi - Don 1904 St. Louis World's Fair
, Lewis yana da mafi girma a duniya carbon arc searchlight shigar a saman dome, 135 feet sama da titin. Haske mai nauyin tan takwas, inci 80 da General Electric ta gina a 1903, hasken mai bincike ya samar da aƙalla wutar kyandir biliyan 1. Fitilar tana da baka mai tsawon kafa bakwai wanda aka kunna da sandunan carbon kuma yana nunawa a cikin madubi na gilashin ƙasa wanda ke ƙara haske.