NSN: 6240-01-344-5137

Technical Characteristics

• Filament Heavy Duty Service Rating

  not rated

• Average Life Rating In Hours

  8000.0

• Emitted Light Characteristic

  colorless

• Light Center Length

  2.438 inches nominal

• Bulb Style

  a (arbitrary designation)

• Light Output Rating

  530.000 lumens nominal single rating

• Burning Position

  any acceptable

• Base Style

  medium screw

• Wattage Rating

  54.000 watts

• Overall Length

  4.375 inches nominal

• Criticality Code Justification

  feat

• Voltage Rating

  120.000 volts minimum and 125.000 volts maximum

• Rated Average Life

  hours

• Filament Designation

  c-11v

• Bulb Light Transmission Characteristic

  transparent

• Special Features

  watt-miser; traffic signal

• Bulb Designator

  a-21

• Current Rating For Which Designed

  0.432 amperes minimum and 0.450 amperes maximum