Linear Microthin Strobe Lights - Model 20.1850 - Linear design provides a wide-angle light beam for superior warning power. Compact size fits in many applications. Field-replaceable 4" linear Xenon flash tube. (20 watt max.) Replaceable polycarbonate lens available in amber, blue, clear, green, red and violet. SAE-certified in all safety colors. Available individually or in 2- and 4-head kits. 2-head kits include (2) lights with bail brackets, (2) 15' shielded cables and (1) 40W, 2-outlet power supply. 4-head kits include (4) lights with bail brackets, (4) 15' shielded cables and (1) 60W, 4-outlet power supply. Made in the U.S.A.