Troubleshooting Steps
1. Ensure light fixtures are properly installed.
2. Ensure appropriate power driver is being used.
3. Ensure light fixtures are receiving the correct amount of voltage.
3. Ensure light fixtures are receiving the correct amount of voltage.
4. Ensure light fixtures are not overpowered.
5. Ensure lights fixtures are not exposed to excess heat.
6. Ensure lights fixtures have no water/moisture damage.
7. Steps to take if light flickering.
8. Determine if light fixtures have reached "end of life" and need replacement.
Determine if light fixtures have reached "end of life" and need replacement.
If the light fixtures are starting to dim after five years of being operated daily they may be reaching their end of life; please call us to order replacements.
Steps to take if light flickering
1. Check Jumper Connections
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Make sure all jumper cords are fully plugged in and secure.
2. Verify Power Supply
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Confirm that the fixture(s) are connected to a Class 2 LED driver.
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If using a hardwired Class 2 LED driver, ensure it was installed correctly by a licensed electrician.
3. Check Fixture Polarity
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Our fixtures are polarized. The jumper cord must be plugged into the correct end of the fixture — the side marked with a small red dot or American flag sticker.
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For more detailed information on correct installation click on the above "1. Ensure light fixtures are properly installed."
Ensure lights fixtures have no water/moisture damage
- If you can see any water and/or condensation within the fixture tube and/or the end caps, your fixture needs to be replaced.
Ensure lights fixtures are not exposed to excess heat
LEDingEDGE fixtures are designed to operate in environments with ambient temperatures up to 170°F (76°C). To ensure optimal performance and prevent premature failure, please follow these installation and usage guidelines when placing fixtures in high-heat environments such as display cases or near heating elements.
Heat-Related Fixture Failures
Warning: Exposure to localized high temperatures can cause fixtures to:
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Dim
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Fail prematurely
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Experience mechanical stress due to expansion and contraction of materials
Installation Guidelines:
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Maintain Clearance:
Fixtures must be installed at least 2” to 4” away from any heating elements. -
Use a Heat Shield:
If heating elements are in close proximity, install a metal strip or heat shield between the fixture and the heat source to reduce radiant heat exposure. -
Fixture Length Recommendation:
Fixtures longer than 45 inches are not recommended for use in hot display cases.- Long extrusions are more prone to expansion and contraction, which can result in mechanical stress and failure over time due to repeated heating and cooling cycles.
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Use High-Temperature Rated Jumper Cords:
Always use LEDingEDGE high-temperature rated jumper cords to ensure safe operation and durability in high-heat conditions.
Ensure light fixtures are not overpowered
Common Causes of Overvoltage:
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Power surges
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Faulty or unregulated power supplies
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Incorrect system design or wiring
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Lightning strikes
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Improper voltage (e.g., connecting a 12V fixture to a 24V supply)
Step 1: Visual Inspection – Clear Tube Fixtures
If your fixture has a clear tube, perform a visual inspection through the lens:
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Check the resistors on the printed circuit board (PCB).
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Look for any of the following signs:
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Burn marks (brown or black discoloration) around the resistors
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Detached or missing resistors
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If any of these signs are present, the fixture has been overpowered and must be replaced.
Step 2: Functional Test – Frosted Tube Fixtures
If the fixture has a frosted tube and cannot be visually inspected:
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Test the fixture using a known working Class 2 LED driver with the appropriate voltage (12VDC or 24VDC).
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If the fixture does not illuminate, it may have been damaged due to overvoltage.
In this case, please contact LEDingEDGE Customer Service for return and replacement procedures.
Preventing Overvoltage
To protect your fixtures:
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Always verify the voltage output of your Class 2 power supply.
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Use surge protection where applicable.
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Ensure all system components are correctly rated and installed.
Ensure light fixtures are receiving the correct amount of voltage
Important: All LEDingEDGE light fixtures must be powered by a Class 2 LED driver.
Symptoms of Driver Failure:
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Fixtures are dim
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Fixtures flicker
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Fixtures do not illuminate at all
Step 1: Check Driver Output with a Voltmeter
Use a voltmeter to measure the output voltage from the Class 2 LED driver:
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Verify that the output is either 12V or 24V, depending on your fixture model.
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If no voltage is present, the driver is likely faulty or not wired correctly.
Step 2: Test with a Known Working Fixture
If you do not have a voltmeter, but you do have a working LEDingEDGE fixture:
- Swap the non-working fixture with the known working one.
- Observe the result:
- If the known working fixture does not light up, the driver, wiring or electrical system is the issue.
If the working fixture lights up, the original fixture is faulty.
- Contact LEDingEDGE for a replacement.
Step 3: Use a Known Working Class 2 Driver (if no spare fixture is available)
If a spare fixture is not available, but you have a known working Class 2 driver:
- Connect the suspect fixture to the working driver.
- Observe the result:
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If the fixture functions normally, the original driver is faulty.
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If the fixture still does not work, the fixture itself has failed.
- Contact LEDingEDGE for a replacement.
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Troubleshooting Tips
LEDingEDGE low voltage lighting fixtures are manufactured with low voltage LEDs each powered at 50mA or 65mA and one resistor for every 4 LEDS if 12V or one resister every 8 LEDS if 24V.
The most common LED light fixture failures are the result of one of following:
- Incorrect installation
- Overpowered
- End of life
- Water or moisture damage
- Exposure to high temperatures (85°C - 185°F) for an extended period
- Flickering light
- Incorrect installation
- Ensure the jumper is fully plugged all the way into the correct end of the light fixture(s) and not loose (the smaller rectangular shape of the connector on the jumper needs to be flush with end cap).
- Our light fixtures are polarized so the first fixture must receive the power by plugging the jumper cord coming from the Class 2 LED driver into the end that has a small red dot or American flag sticker on it. If this first fixture is then connected to additional fixture(s) the jumper cord(s) need to come from the powered fixture and then also connected into the side of the additional fixture with the red dot or American flag sticker.
- If there is no sticker, ensure the jumper cord connectors are inserted correctly into the end cap ports. Note that at one end of the light fixture the end cap port has a flat bottom and a polarized top key; the other end of the same light fixture has an end cap port with a flat top and a bottom with a polarized bottom key (see below pictures).
End cap with polarized top key and Jumper with polarized groove

End cap with polarized bottom key and Jumper with polarized groove

- Overpowered:
- If your fixtures have been overpowered with a power surge or were overpowered by being connected to more than the required 12vDC or 24vDC power supply, then the resistor will fail causing the LEDS to not illuminate.
- If your fixture is in a clear tube, you can visually look through the lens and see if the resistors are still attached to the PCB (printed circuit board) or if they have brown or black stains around the resistors. If you see brown or black stains, or no resistors, then the fixtures have been overpowered and need to be replaced.
- If your light fixture has a frosted tube and you believe it has been overpowered, you can test this fixture with an appropriate working Class 2 LED driver. If it still does not work, contact our customer service department for return procedures.
- End of life:
- If the light fixtures are starting to dim after five years of being operated daily they may be reaching their end of life; please call us to order replacements.
- Water and / or condensation damage:
- If you can see any water and/or condensation within the fixture tube and/or the end caps, your fixture needs to be replaced.
- Heat damage:
- Our fixture will operate in an environment up to 170 ° F.
- If your fixture is too close to a heating element it could cause your fixture to fail or dim. To avoid this possibility, all fixtures need to be a minimum of 2”-4” from heating elements and if possible, an additional metal strip should be provided as a shield between the heating elements and the fixture.
- We recommend that any light fixture longer then 45” not be used in hot cases as expansion/contraction of the extrusions may occur when they are exposed to heat and then cooling, resulting in failures.
- Our high temperature rated jumper cords need to be used.
- Flickering light:
If your light fixture is flickering light, please take the following steps:- Ensure the jumpers are plugged in all the way.
- Ensure that the light fixture(s) is connected to a Class 2 LED driver correctly; if using a hard wire Class 2 LED driver, ensure it is hard wired correctly by a licensed electrician.
- If the light is still flickering, ensure the jumper is plugged into the correct end (our light fixtures are polarized so the side where power is going into must be plugged into the correct end; usually there should be a small red dot or American flag sticker on this side). See point #1 above for more information.
Troubleshooting Tips
LEDingEDGE low voltage lighting fixtures are manufactured with low voltage LEDs each powered at 50mA or 65mA and one resistor for every 4 LEDS if 12V or one resister every 8 LEDS if 24V.
The most common LED light fixture failures are the result of one of following:
- Incorrect installation
- Overpowered
- End of life
- Water or moisture damage
- Exposure to high temperatures (85°C - 185°F) for an extended period
- Flickering light
- Incorrect installation
- Ensure the jumper is fully plugged all the way into the correct end of the light fixture(s) and not loose (the smaller rectangular shape of the connector on the jumper needs to be flush with end cap).
- Our light fixtures are polarized so the first fixture must receive the power by plugging the jumper cord coming from the Class 2 LED driver into the end that has a small red dot or American flag sticker on it. If this first fixture is then connected to additional fixture(s) the jumper cord(s) need to come from the powered fixture and then also connected into the side of the additional fixture with the red dot or American flag sticker.
- If there is no sticker, ensure the jumper cord connectors are inserted correctly into the end cap ports. Note that at one end of the light fixture the end cap port has a flat bottom and a polarized top key; the other end of the same light fixture has an end cap port with a flat top and a bottom with a polarized bottom key (see below pictures).
End cap with polarized top key and Jumper with polarized groove

End cap with polarized bottom key and Jumper with polarized groove

- Overpowered:
- If your fixtures have been overpowered with a power surge or were overpowered by being connected to more than the required 12vDC or 24vDC power supply, then the resistor will fail causing the LEDS to not illuminate.
- If your fixture is in a clear tube, you can visually look through the lens and see if the resistors are still attached to the PCB (printed circuit board) or if they have brown or black stains around the resistors. If you see brown or black stains, or no resistors, then the fixtures have been overpowered and need to be replaced.
- If your light fixture has a frosted tube and you believe it has been overpowered, you can test this fixture with an appropriate working Class 2 LED driver. If it still does not work, contact our customer service department for return procedures.
- End of life:
- If the light fixtures are starting to dim after five years of being operated daily they may be reaching their end of life; please call us to order replacements.
- Water and / or condensation damage:
- If you can see any water and/or condensation within the fixture tube and/or the end caps, your fixture needs to be replaced.
- Heat damage:
- Our fixture will operate in an environment up to 170 ° F.
- If your fixture is too close to a heating element it could cause your fixture to fail or dim. To avoid this possibility, all fixtures need to be a minimum of 2”-4” from heating elements and if possible, an additional metal strip should be provided as a shield between the heating elements and the fixture.
- We recommend that any light fixture longer then 45” not be used in hot cases as expansion/contraction of the extrusions may occur when they are exposed to heat and then cooling, resulting in failures.
- Our high temperature rated jumper cords need to be used.
- Flickering light:
If your light fixture is flickering light, please take the following steps:- Ensure the jumpers are plugged in all the way.
- Ensure that the light fixture(s) is connected to a Class 2 LED driver correctly; if using a hard wire Class 2 LED driver, ensure it is hard wired correctly by a licensed electrician.
- If the light is still flickering, ensure the jumper is plugged into the correct end (our light fixtures are polarized so the side where power is going into must be plugged into the correct end; usually there should be a small red dot or American flag sticker on this side). See point #1 above for more information.
Ensure light fixtures are properly installed
a. Plug in the Jumper Cord Securely
Make sure the jumper cord is:
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Fully inserted into the light fixture’s port.
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Not loose.
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Aligned correctly — the smaller rectangular connector on the jumper must sit flush with the fixture’s end cap.
b. Power the First Fixture Correctly
These fixtures are polarized, meaning power must enter in a specific direction.
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Find the end of the fixture with a red dot or American flag sticker — this is the power input side. Plug the jumper cord from the Class 2 LED driver into this side with the red dot or American flag sticker.
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When connecting additional multiple fixtures in a single run:
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After the first fixture is powered correctly (via the jumper cord from the Class 2 LED driver into the side marked with a red dot or American flag sticker), use additional jumper cords to connect from the powered fixture to the next fixture in line. When doing this always plug the jumper cord into the sticker-marked side of each additional fixture.
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Repeat this for each fixture in the run, maintaining the correct orientation (sticker side = power input side).
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c. If No Sticker is Present
Check the end cap port shape to determine the correct orientation:
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One end of the fixture: port has a flat bottom with a keyed (polarized) top.
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Other end: port has a flat top with a keyed (polarized) bottom.
Ensure the jumper cord connector matches the port shape and keying before plugging in.
End cap with polarized top key and Jumper with polarized groove

End cap with polarized top key and Jumper with polarized groove

Ensure appropriate power driver is being used
a. Use Only Class 2 LED Drivers
All LEDingEDGE light fixtures must be powered by a Class 2 LED driver to ensure safe and proper operation.
b. Match Voltage Requirements
Ensure the voltage of the LED fixture (12V or 24V) matches the output voltage of the selected LED driver (12V or 24V).
- For 24V Class 2 drivers, the maximum output is 100W.
- For 12V Class 2 drivers, the maximum output is 60W.
d. Calculate Wattage Requirements Properly
- The total wattage of all connected fixtures in a series must be less than the power driver's output capacity.
- Refer to our SPEC sheets for individual fixture wattages.
- Add the wattages of all connected fixtures to determine total load.
- To maintain optimal performance and longevity, we recommend not exceeding 80% of the driver’s total wattage capacity.