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Flash Products

Vanguard® Medium FTS 370d Lighting System for MET Mast Towers

Dual FAA L-864 / L-865 Wind Farm Lights

The Vanguard Medium FTS 370d is a dual (white, red and infrared) FAA L-864/L-865 LED aviation obstruction lighting system. It is suitable for towers between 200′ and 700′ AGL (FAA E-type towers) including meteorological (or MET mast) towers. The FTS 370d uses a single cable for both power and communication.


Standard Features

  • Aircraft Detection Lighting Systems (ADLS) interface
  • Infrared (IR) LEDs on the flashhead for compatibility with NVG and NVIS per FAA AC 150/5345-43J
  • Patented Fresnel optics to minimize ground scatter
  • Interleaved LEDs and by-pass circuitry for longer life
  • Surge immunity of 25kA to withstand 99% of all lighting strikes
  • Powder-coated aluminum top plate, base and controller box to prevent corrosion or damage from flying debris like ice
  • 4-line OLED backlit on-board user interface for diagnostics and programming
  • Photodiode uses ruggedized metal housing and is equipped with shielded cable to prevent EMI interference and crosstalk
  • Input power breaker switch eliminates replaceable fuses
  • Outdoor Wi-Fi antenna for onsite diagnostics, programming and lighting inspections
  • Automatic failsafe switches to day mode if no mode change detected
  • 6 dry contacts for monitoring
  • 5-year parts warranty


System Options

  • Infrared LEDs on L-810 marker lights
  • SMART Card
    • Monitor and control the system remotely
    • Receive full diagnostic information through LTE modem or ethernet-based connectivity via SNMP or Modbus protocols
    • Upgrade firmware remotely
  • GPS synchronization


Regulatory Compliance

  • FAA L-864/L-865 under AC 70/7460-1L
  • ICAO Medium Intensity types A and B
  • CAR 621 CL-864/CL-865
  • DGAC L-864/L-865
  • CSA
  • CE



  • 5-year parts warranty

Please fill out the form below or call 615.503.2000 with questions or to order this product.

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    Input Voltage

    100-240 VAC
    ±24 VDC (optional)
    ±48 VDC (optional)


    50-60 Hz

    Marker Power Consumption

    2.1 watts per marker*
    3.4 watts per marker with IR

    Marker Dimensions

    9” x 2.75” x 2.13” (228.6 x 69.9 x 54.1 mm)

    Marker Weight

    1.6 lbs. (0.7 kg)

    FH Dimensions

    15.75″ dia. x 7.31″

    FH Aerodynamic Wind Area

    99.125 in2

    Controller Dimensions

    23″ x 17.13″ x 6.44″

    Controller Weight

    44 lbs (20kg)

    Protection Rating

    IP65, NEMA 4x

    * Not included in system consumption


    L-864/L-865 System Power Consumption

    White Day

    80 watts (70 watts with IR)
    40 fpm
    20,000 ± 25% ECD

    Red Night

    40 watts (40 watts with IR)
    20/30/40 fpm
    2,000 ± 25% ECD

    White Night

    40 watts (40 watts with IR)
    40 fpm
    2,000 ± 25% ECD


    L-866/L-885 System Power Consumption

    White Day

    110 watts (100 watts with IR)
    60 fpm
    20,000 ± 25% ECD

    Red Night

    50 watts (50 watts with IR)
    60 fpm
    2,000 ± 25% ECD

    White Night

    50 watts (50 watts with IR)
    60 fpm
    2,000 ± 25% ECD


    * Only 30 fpm flash rate is applicable for FAA certified applications filed under AC 70/7460-1L, and requires the use of L-810(F) depending on the height of the structure


    FAA logoIntertek FAA L-864 FTS 370d certification
    Intertek FAA L-865 FTS 370d certification
    Intertek L-885 FTS 370d/r catenary certification
    Intertek L-866 FTS 370d catenary certification
    Transport Canada CAR 621 logoTVOC CAR 621
    Intertek CAR 621 (Infrared)
    ICAO logoICAO 6th Edition
    DGAC Mexico logoDGAC L-864
    DGAC L-865
    CSA logoCSA Certificate of Compliance FTS 370d/r/w
    CE logoCE Declaration of Conformity FTS 370d
    Flash Technology is an ISO 9001:2015 certified manufacturing facility.Flash Technology is an ISO 9001:2015 manufacturing facility.



    FTS 370d Datasheet for MET tower lighting


    Current Manual

    Vanguard Medium FTS 370d / FTS 370w / FTS 370r / FTS 370c Rev 20 (7.4 MB)
    Quick Start Guide
    Troubleshooting Guide
    Manuals for older product revisions can be found in the Knowledge Base.


    Vanguard Medium Firmware
    Vanguard Medium SNMP MIB


    Flash Technology Vanguard Medium-HD