OL370d Medium Intensity Dual Obstruction Light

The OL370d is a dual medium-intensity LED obstruction lighting system ideal for FAA E-type towers between 200′ and 700′ AGL. It uses a simplified single enclosure and cable system for power, control, and monitoring, ensuring streamlined operation and quick and easy status monitoring.


  • Fully compliant with:
    • FAA L-864/L-865 dual medium-intensity flashing obstruction light configurable to meet both AC 70/7460-1K and 1L
    • ICAO 7th edition standards for medium-intensity type A/type B obstacle lights
    • CAR 621 2nd edition for medium-intensity CL-864/CL-865 flashing lights
    • FAA L-885 low-intensity catenary requirements
  • Single enclosure and cable system makes setup easy
  • Flexible status monitoring thanks to LTE data connectivity
  • Robust, low-maintenance design
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Models and Options

Lightning Protection
With a surge suppression rating of 25kA, the OL370d offers protection against 99% of lightning strikes. With a properly grounded tower, even an intense lightning strike of 200kA will only deliver 22.5kA to the flashhead cable, still lower than the OL370d's 25kA rating.
Data Connectivity
The OL370d has reliable remote monitoring capabilities through AT&T, Verizon LTE, and others. Customize your monitoring to your needs.
Easy Installation
The OL370d's L-810 markers weight under a pound and only require two adjustable straps to mount. The L-864 beacon is lightweight and versatile, coming with two lockable twist knobs for easier access, a water channel to prevent water from getting in the door, and knock-out holes at the bottom of the enclosure for simplified cable installation.

OL370d: Get A Quote

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When you decide to use our obstruction lights, our team is here to help. We offer free site assessments to determine the products you need for your project and location. You’ll get a free Energy Balance Report™ and lighting layout. Get more details and sign up now—it’s free!

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Light Specifications and Documents

  • Input Voltage:
    • 120-240 VAC at 50/60 Hz
    • ±24 VDC (optional)
    • ±48 VDC (optional)
  • Frequency: 50-60 Hz
  • Marker Power Consumption: 2.1 watts per marker (not included in system consumption)
  • 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)
Click Here To See All Specs
Input Voltage
120-240 VAC at 50/60 Hz
±24 VDC (optional)
±48 VDC (optional)
50-60 Hz
Marker Power Consumption2.1 watts per marker (not included in system consumption)
Marker Dimensions9″ x 2.75″ x 2.13″
(228.6 x 69.9 x 54.1 mm)
Marker Weight1.6 lbs (0.7 kg)
FH Dimensions15.75″ dia. x 7.31″
400.0 mm dia. x 180.57 mm
FH Weight26.3 lbs (11.93 kg)
FH Aerodynamic Wind Area99.125 in2 (63,900.51 mm2)
Controller Dimensions23″ x 17.13″ x 6.44″
Controller Weight44 lbs (20 kg)
Protection RatingIP65, NEMA 4X


Power Consumption (with IR)Flash Rate (per min)Flash Intensity
Day (white)80W (70W)40 flashes20,000 ± 25% ECD
Night (red)40W (40W)20/30/40 flashes2,000 ± 25% ECD
Night (white)40W (40W)40 flashes2,000 ± 25% ECD
Day (white)110W (100W)60 flashes20,000 ± 25% ECD
Night (red)50W (50W)60 flashes2,000 ± 25% ECD
Night (white)50W (50W)60 flashes2,000 ± 25% ECD

Light Compliance and Certifications

Our solar- and AC/DC-powered obstruction lighting systems are designed to meet your relevant federal aviation regulations. Our thorough product testing and Intertek certifications ensure your light will meet your requirements over the long term. Want proof? See our certificates below. If you have any questions about specific lighting requirements relating to your project, please contact us.