OL371 Medium Intensity Obstruction Lighting System

Carmanah Obstruction is now part of Flash Technology




Carmanah Obstruction is now part of Flash Technology, an SPX Corporation business.

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Learn about our Technology

Models and Options

OL371 Marker Light Angle
The markers of our OL371 obstruction lighting system have FAA L-810 compliant light output, with a 17° peak and a vertical divergence between 4° and 20°. Using Fresnel optics, the markers also provide a beam spread that can accommodate angled towers up to 8° without hardware adjustment.
OL371 Standard Controller Box
The go-to solution for towers up to 350 feet, the OL371 Standard can support up to four L-810 markers and one L-864 beacon.
OL371 SMART Controller Box
The OL371 SMART supports additional beacons and markers making it an ideal solution for towers higher than 350 feet. It also includes added dry contact alarms and an SNMP monitoring system for two-way communication, fault notifications, and more.

OL371: Get A Quote

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Get a free site assessment

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:
    • 85-265 VAC at 50/60 Hz
    • 12-48 VDC ±10% (12 VDC for markers only)
  • Protection Rating: IP65, NEMA 4X
Click Here To See All Specs
Input Voltage
85-265 VAC at 50/60 Hz
12-48 VDC ±10% (12 VDC for markers only)
Protection Rating


Polycarbonate Controller7.8 x 8.25 x 4”
(198.1 x 209.6 x 101.9 mm)
AC/DC2.1 lbs (0.95 kg)
Flashhead15.75” dia. x 7.5”
(400 dia. x 190.5 mm)
AC/DC25.6 lbs (11.7 kg)
Marker (Single L-810)9 x 2.75 x 2.13”
(228.6 x 69.9 x 54.1 mm)
DC1.6 lbs (0.7 kg)
OL2 (Double L-810)11.0 x 5.0 x 8.75”
(279.4 x 127 x 222.25 mm)
DC5.4 lbs (2.45 kg)


Power Consumption (watts)
20 fpm30 fpmSteady
FTC 371AC0.90.90.9
FH 371AC4.05.330
Marker 371 (Single L-810)DC0.52.5
OL2 (Double L-810)DC1.05.0

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.