illuminate taxiing operations. Still other aircraft utilize  a dimming resistor in the landing light circuit to provide  reduced illumination for taxiing. A typical circuit for taxi  lights is shown in  Figure 9-180 . Some large aircraft are equipped with alternate taxi lights  located on the lower surface of the aircraft, aft of the nose  radome. These lights, operated by a separate switch from the  main taxi lights, illuminate the area immediately in front of  and below the aircraft nose. Some aircraft are equipped with wing inspection lights to  illuminate the leading edge of the wings to permit observation  of icing and general condition of these areas in flight.  These lights permit visual detection of ice formation on  wing leading edges while flying at night. They are usually  controlled through a relay by an on/off toggle switch in the  cockpit. Some wing inspection light systems may include  or be supplemented by additional lights, sometimes called  nacelle lights, that illuminate adjacent areas, such a cowl  flaps or the landing gear. These are normally the same type  of lights and can be controlled by the same circuits. Aircraft are equipped with interior lights to illuminate the  cabin.  [Figure 9-181]  Often white and red light settings are  provided. Commercial aircraft have a lighting systems that  illuminates the main cabin, an independent lighting system  so that passengers can read when the cabin lights are off, and  an emergency lighting system on the floor of the aircraft to  aid passengers of the aircraft during an emergency.  Interior Lights Wing Inspection Lights Figure 9-181.  Interior cockpit and cabin light system. Figure 9-180.  Taxi light circuit. 9-104 24-53-02 CB121 TAXI LIGHT 15A CB178 R LANDING LIGHT 10A W159 L178A16 L178A16 C L177A18N L176B18 DS110 XDS110 RIGHT LANDING LIGHT C L179A16N L178B16 DS106 XDS106 TAXI LIGHT C L174A18N L173B18 DS109 XDS109 LEFT LANDING LIGHT L173A18 CR127 CR126 CR217 TB102 2 5 4 3 1 31-51-04 L30A22 32-61 S104-4-20 4 5 32-61 6 S104 NOSE GEAR UP LOCK SWITCH A223 PANEL ASSY - SUBPANEL, L INBOARD CB177 L LANDING LIGHT 10A 24-53-01 W119