Flash Products

Vanguard® Medium FTS 370r Red LED

L-864 Tower Light or L-885 Catenary Light

Designed for ease of installation, the Vanguard Medium FTS 370r red LED tower lighting system is a red L-864 obstruction light or L-885 catenary light for structures taller than 150’ (FAA tower types A1-A3). 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 370r’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 370r 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 370r 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
  • Configurable to meet AC 70/7460-1L (avian-friendly)
  • 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 370r 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

Marker Power Consumption

2.1 watt 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. (20 kg)

Protection Rating

IP65, NEMA 4x

* Not included in system consumption


System Power Consumption

L-864 Red Night

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

L-885 Red 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


Intertek FAA L-864 FTS 370d certification
Intertek CAR 621 (with infrared)
ICAO 6th Edition
DGAC L-864
CSA Certificate of Compliance FTS 370d/r/w and FTS 370d/r/w IR
CE Declaration of Conformity FTS 370r



FTS 370r 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