Flash Products

Vanguard® Medium FTS 370w White LED

L-865 Tower Lights or L-866 Catenary Lights

Designed for ease of installation, the Vanguard Medium FTS 370w White LED tower lighting system provides white-only L-865 obstruction lighting or L-866 catenary lighting for structures between 200’ and 700’ AGL (FAA D-tower types). Efficiencies are engineered throughout the system, such as a single flashhead and marker cable for power and communication as well as a single enclosure for power, control and monitoring.


Vanguard Medium offers numerous monitoring and control options and is one of the most versatile lighting systems on the market.



Lightning Protection

The Vanguard Medium product line protects against 99% of lightning strikes, including the most intense strikes. It has a surge suppression rating of 25kA, validated by multiple lightning test laboratories. A properly grounded tower should take 55% of the lightning energy through the steel tower and to the ground, leaving 45% to be distributed amongst the cables. An average lightning strike is 28kA, with a 200kA strike happening less than 1% of the time. A 200kA strike on a tower using an average of 4 cables will deliver 22.5kA to the flashhead cable, much less than the FTS 370w’s 25kA rating.


Data Connectivity

Choose from many options to customize monitoring to your needs, whether performed by your NOC or by Flash Technology. Connectivity options include AT&T and Verizon LTE with supplied monitoring devices as well as an ethernet port. Modbus and SNMP protocols support third-party monitoring.


Easier Installation

Flash Technology’s LED L-810 marker is an integral part of the FTS 370w solution. At less than a pound in weight and requiring only two adjustable straps to mount, it’s the easiest marker to install on the market.


Made of powder-coated, lightweight aluminum, the versatile enclosure makes installation easier and reduces operating temperatures. Two lockable twist knobs provide easy access. A water channel diverts water away from the door opening. And knock-out holes in the bottom of the enclosure simplify cable installation.


FTS 370w Vanguard Medium Features

  • Interleaved LEDs and by-pass circuitry provide longer life by allowing the loss of individual LEDs up to the 25% limit
  • Industry-leading IEC 61000-4-5 surge immunity to 25kA
  • LTE modem for greater reliability
  • Ruggedized photodiode in metal housing with shielded cable
  • Input power breaker switch eliminates replaceable fuses
  • Outdoor Wi-Fi antenna for diagnostics and lighting inspections
  • Patented Fresnel optics to minimize ground scatter
  • Aircraft Detection Lighting Systems (ADLS) interface
  • Automatic failsafe switches to day mode after 19 hours of no mode change; can be disabled if necessary
  • 4-line OLED backlit display for visibility in any lighting conditions
  • Dry contact monitoring (day, night, marker, PED, GPS, comm alarms and mode status)
  • 5-year warranty


FTS 370w Vanguard Medium Options

  • Infrared lighting – NVG and NVIS compatibility using 850nm infrared (IR) LEDs
  • SMART Card – monitor and control the system remotely and receive full diagnostic information through LTE modem or ethernet-based connectivity. SNMP, Modbus or Eagle Protocols can be used.
  • GPS synchronization
  • Upgrade firmware remotely
  • TECK90 Support – provides protection from RF interference and damage on high-power broadcast towers up to 700′ AGL


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

Input Voltage

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


50-60 Hz

FH Dimensions

15.75″ dia. x 7.31″ height

FH Weight

26.3 lbs (11.92 kg)

FH Aerodynamic Wind Area

99.125 in

Controller Dimensions

23″ x 17.13″ x 6.44″

Controller Weight

44 lbs. (20 kg)

Protection Rating

IP65, NEMA 4x


L-865 System Power Consumption

White Day

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

White Night

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


L-866 System Power Consumption

White Day

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

White Night

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


Intertek L865 FTS 370w Certification (AC 150/5345-43H)
Intertek L865 FTS 370w Certification (AC 150/5345-43G)
Intertek CAR 621 (with infrared)
ICAO 6th Edition
CSA Certificate of Compliance FTS 370d/r/w and FTS 370d/r/w IR
CE Declaration of Conformity FTS 370w



FTS 370w Vanguard Medium Datasheet


Current Manual

Vanguard Medium FTS 370d / FTS 370w / FTS 370r / FTS 370c Rev 19 (5.7MB)
Quick Start 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