OL2A versus Tractor-Trailer

OL2A solar obstruction light still flashing after tractor-trailer runs it over at railyard



Our OL2A is built tough to withstand the harsh conditions of its many applications, from construction zones to mining sites. At a railyard in Pennsylvania, a customer recently received unexpected proof of our claims, when a tractor-trailer accidentally ran over a blue safety flag, crushing the blue OL2A safety light attached to it.


In railyards, the blue safety flag and blue light alert railroad operators that workers are on, under, or between railroad equipment. Many railroads select our blue solar lights because they last 5+ years with no battery change and can withstand dust, extreme heat, water, and other environmental hazards. Would the OL2A survive under the weight of a tractor-trailer?

Robert Freshley, Assistant Manager of Operations & Maintenance at the Pennsylvania railyard, reports that the flange mount was the only part of the light that was damaged, leaving the rest of the light completely intact and functioning. The premium grade polycarbonate body and lens were durable enough to withstand the pressure: the OL2A is MIL-STD-202G compliant for shock and vibration.

Damaged but still functioning OL2A solar blue flag light
Crews removed the OL2A solar blue flag light from the flag post to inspect the damage.

Carmanah’s Customer Support team quickly sent Freshley a replacement flange mount base.

“Thanks again for the new base, and for a product that actually lives up to its advertised capabilities,” says Freshley.

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Learn more about the OL2A

The OL2A isn’t just resistant to tractor-trailers rolling over it. It is also dustproof, waterproof, shockproof, and resistant to extreme temperatures. We put it to the test in this video to prove it.

Watch our OL2A extreme testing video

OL2A Extreme Testing Video


The OL2A is a tough safety light with the best performing battery on the market—meaning no maintenance or battery replacements for 5+ years. Shockproof, waterproof, and built to last, the OL2A will be the most reliable piece of your safety arsenal for years to come.

This extreme testing video showcases the performance and durability of the OL2A solar safety light:

  • Waterproof – The OL2A can be completely submerged and will still turn on.
  • Shockproof – This small, compact light can tumble down a rock cliff, and will still turn on.
  • Durable – The light is able to withstand vibrations, and the plastic won’t crack or fly off. In this example, the OL2A is mounted to a railway blue flag pole and falls down onto the track, undamaged.
  • Weatherproof – Frozen in a large block of ice, the OL2A withstands not only the cold conditions, but also the impact of a bat hitting and breaking apart the ice block that surrounds it.





Battery lifeLasts 5+ years with no change. Includes replaceable AA NiMH batteries.
WeightOur products are some of the lightest in the industry. Flange Mount: 0.8 lbs (0.37 kg)
Operating conditionsOperates in -22 to 122 ºF (-30 to 50 ºC) conditions.

Can be stored in -40 to 176 ºF (-40 to 80 ºC) conditions.

Life expectancy and warranty15-year life expectancy means replacement costs remain low. 3-year warranty provides peace of mind the light will work as expected.
StandardsISO 9001:2008 certified, RoHS, WEEE, FCC, CE

MIL-STD-202G (for Shock and Vibration)


Learn more by visiting our OL2A product page.

Learn more about the OL2A

OL2A Solar Obstruction Light Battery Replacement

How to change the OL2A’s batteries

Time for a battery change in your OL2A? In this video, we are going to learn how to remove and replace the battery in the Carmanah OL2A solar-powered obstruction light. Watch below, or keep scrolling to read the summary.

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Video overview

In this video, we are going to change the batteries in our OL2A solar-powered obstruction light.

  1. Using a #2 Phillips screwdriver, remove the three screws on the bottom of the light.
  2. Inspect the gore vent for damage.
  3. Replace the batteries. Note: the batteries must be replaced with rechargeable NiMH batteries. Note the orientation of the batteries We recommend purchasing replacement batteries from Carmanah; however, using the same type of rechargeable battery will not void the product warranty.
  4. Check the condition of the gore vent and of the O-ring. We recommend applying a small amount of silicone grease or O-ring lubricant to the O-ring prior to reassembly.
  5. Retighten the screws. When retightening the screws, do not fully tighten each screw before moving on to the next. Instead, partially tighten each screw then move to the next until the bottom cover is fully and evenly seated against the body of the light.

For the pole mount version:

  • Check condition of gore vent
  • Apply O-ring lubricant
  • Reinstall O-ring retainer
  • Insert lower portion of light body

Partially retighten each screw working with each screw diametrically across from the last. Ensure that the lower portion of the light is fully seated and that the screws are tight enough to compress the O-ring. Continue to tighten all the screws until you can no longer detect any internal movement of the O-ring retainer.

For more information

If you have any questions, please contact obstruction@carmanah.com or salesengineering@carmanah.com.

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Visit our product page to learn more about the OL2A.

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OL2A Solar Obstruction Light Basic Programming

A quick look at basic OL2A programming using the Infrared Programmer

Ready to get started with your OL2A programming? In this video, we are going to learn how to program the Carmanah OL2A solar-powered obstruction light using the infrared programmer. Watch below, or keep scrolling to read the summary.

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Video overview

In this video, we are going to have a quick look at basic programming of the Carmanah OL2A, solar-powered obstruction light using the miniature infrared programmer.

The IR programmer is required to make programming changes to the OL2A. If you do not have an IR programmer, you can order one by contacting obstruction@carmanah.com.

Today we are going to use the mini programmer to:

  • Change the flash character
  • Check the battery health
  • Change the intensity

To communicate with the light or wake the light up, simply point the IR programmer in the direction of the light and push the power button. This step is required before any programming changes can be made. The light will respond with one quick flash to indicate that it is ready to receive further commands. Note: When you first attempt to wake up the light, hold the power button for two seconds to take the light out of IR sleep efficiency mode.

Now that the light is out of sleep mode, it will respond every time that we press the power button.

When the light accepts a key valid key sequence, it will flash in quick succession three times. If the programming attempt is unsuccessful, the light will flash twice slowly.

To change the flash character, simply press, power + the 3-digit flash character + the checkmark We will set our flash character to 055, 0.5 seconds on, 1.5 seconds off.

To check the battery health, press Power + 810 Checkmark or simply press the letter “i.”

  • Three flashes = good battery
  • Two flashes = the battery needs charging
  • One flash = the battery is a very low state-of-charge

To change the intensity, we will again follow the same key sequence, which is power + the 3-digit code + the check mark.

We will set our OL2A to 10 cd. So, we will push the power button + 610 + the checkmark. Note: When changing either the flash character or the intensity, please contact Carmanah for confirmation that the desired settings can be supported in your region. This will ensure reliable and sustainable operation.

For more information

Please reference the user manual for additional guidance on programming or contact obstruction@carmanah.com.

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Unboxing the OL2A Solar Obstruction Light

Your first look at the OL2A

Wondering what you’ll get when you order our lights? In this video, we are going to have a quick look at the Carmanah OL2A solar-powered obstruction light. Watch below, or keep scrolling to read the summary.

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Video overview

In the box, you will find the light and a user manual. If you do not have a user manual, you can find an electronic version on our website. Click here to download a copy of the OL2A user manual.

The OL2A comes in three basic configurations: a flange version with external ON/OFF switch, a flange version with no external switch, and a pole mount version. Note: the pole mount version is not available with an external switch.

The OL2A comes from the factory with the batteries installed and is preprogrammed and ready to operate. Carmanah also sells a miniature infrared programmer for adjusting product settings. Note: the IR programmer is not required unless you want to change the product settings.

To operate the switched version, set the switch to ON and mount the product in the desired location. To operate the non-switched models, simply mount the product in place and when night comes, the product will automatically turn on at the preprogrammed settings. Note: the OL2A has advanced day/night detection. It can take up to 1 minute for the product to determine that it is day or night; this prevents the light from making false transitions.

If you are planning on storing the product in the box after the initial inspection, ensure that the switch is in the OFF mode. For the non-switched model, ensure that the light has been turned off via the IR remote. The product does have an automatic shutdown feature, but for optimal battery health, we recommend storing the product in the OFF state.

For more information

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Visit our product page to learn more about the OL2A.

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