Series 400 Light Strip (black). Standard unit includes 24v. 5w. festoon lamps at 2 1/8"(54mm) on center and crimp-on spade connectors. Optional festoon lamps 24v 3w, 5w, 10w; 12v 5w, 10w. Series 400 is recommended when using optional halogen inserts (HS-H1 and HS-R3) and lamps.