TM 10-6640-239-13 2-6 c. Lighting Controls and Indicators.  Figure 2-4 and Table 2-4 list the lighting controls and indicators. Table 2-4.  Lighting Control and Indicators Index Number Control or Indicator Function 1 Rear Door Light Switches Controls rear fluorescent light operation. 2 Rear Door Emergency Light Switch Controls emergency light operation. 3 Rear Door Blackout Switch Control laboratory blackout lights when rear door is opened. 4 Curbside Door Emergency Light Switch Controls emergency light operation. 5 Curbside Door Light Switches Controls forward fluorescent light operation. 6 Gum Bath Light  Switch Controls gum bath light in laboratory. 7 Mechanical Room Light Switch Controls mechanical room fluorescent light operation. 8 Fume Hood Light Switch Controls fume hood light in laboratory. 9 Mechanical Room Blackout Switch Controls mechanical room blackout lights when mechanical room door is opened. 10 Curbside Door Blackout Switch Controls laboratory blackout lights when curbside door is opened.