LED Obstruction Lighting Controller with Transfer Relay & Alarm | FL-81051

Compliance and Applications

• FAA AC 150/5345-43G

Our FL-81051 LED obstruction lighting controllers have been designed to reliably sense the proper operation of the latest low-power LED obstruction lights, with an array of dry alarm contacts to report on all aspects of system health.

Ordering Codes

Model# of CircuitsInput VoltageOption
FL-81051S: for Single Lights
FL-81051D: for Dual Lights
1: One Circuit
2: Two Circuits
3: Three Circuits
4: Four Circuits
AC1: 120VAC
AC2: 240VAC
AC3: 277VAC[1]
F: Flasher
TR: Transfer Relay[2]
[1] Controller will convert 277VAC input to 120VAC output.
[2] For FL-81051D Dual Lights model only.


• AC Input - 120V AC, 240V AC, or 277V AC
• Sophisticated current sensing enables reliable monitoring of the latest low-power LED obstruction lights
• Factory configured for: up to 4 circuits of L-810 lights, single or dual
• Up to 10 single or 5 dual obstruction lights per circuit
• Transfer Relay mode available - energizes backup lighting in the event of a failure, up to 4 individual transfer relays
• Controller can be configured to operate L-810 sidelights in flashing or steady-burn mode
• Controller powers lights even if the photocell fails
• FAA photocell and bracket included
• User-friendly connectors
• Integrated surge protection
• Resistant to corrosion, shock and vibration
• Operates from -55° C to +55° C
• 2 year warranty


• Input Power: 120V AC 50/60Hz, 240V AC 50/60Hz, or 277V AC 60Hz
• Enclosure Rating: NEMA 4x Polycarbonate (15.37"H x 13.28"W x 7.13"D)
• Controllers requiring 3-4 circuits and a flasher will be installed in a larger NEMA 4 Aluminum Enclosure (20"H x 16"W x 7.32"D)
• Surge Protection: MOV
• Alarm Type: Dry Contacts, Form “C”
• Warranty: 2 year limited warranty
• Compatibility: Controller will only work with Flight Light (Farlight) model FL-810L and FL-810LNV LED obstruction lights. The controller has not been calibrated to work with other lights.

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