Why Are My JellyFish Lights Flickering or Dimming Randomly?
- Loose wire connection at the controller port or at an inline connector along the run is causing intermittent signal/power interruption
- Voltage drop on a long wire run — sections far from the controller receive insufficient 48V due to wire resistance over distance
- Moisture intrusion at a connector or wire junction following rain or temperature changes causing intermittent resistance
Problem Description
JellyFish lights that flicker, pulse, or dim unexpectedly during operation indicate a power delivery problem, a loose connection, or a wiring issue somewhere between the controller output and the affected light section.
Symptoms
- Lights flicker visibly during normal operation on a solid color or static pattern
- Brightness drops spontaneously then recovers on sections of the run
- Flickering is worse on sections farthest from the controller
- Flickering started after weather events including heavy rain, ice, or high winds
- Certain colors or brightness levels trigger flickering while others do not
Recognize these? Here's what usually causes it.
Common Causes
- Loose wire connection at the controller port or at an inline connector along the run is causing intermittent signal/power interruption
- Voltage drop on a long wire run — sections far from the controller receive insufficient 48V due to wire resistance over distance
- Moisture intrusion at a connector or wire junction following rain or temperature changes causing intermittent resistance
- Degraded or corroded inline connector from years of outdoor exposure
- Overloaded controller port — too many light sections on a single port causing power fluctuation
Most fixes happen in the first 3 steps.
Persistent flickering that is not resolved by inspecting connectors requires an authorized dealer inspection. Attempting to repair connectors without proper weatherproof sealing will result in recurring moisture failures. Always use connector sealant rated for outdoor use when re-seating or replacing outdoor wire connectors.
Tools & Requirements
Step-by-Step Solution
Flickering After Winter Is Common
In cold climates, ice expansion and contraction cycles stress wire connectors and can loosen connections that were tight during installation. An annual spring inspection by your authorized dealer — including re-seating all accessible connectors — prevents this from becoming a recurring issue.
Connector Sealing Matters
JellyFish installers use weatherproof connector sealant during installation. If a repair was done without re-sealing the connector, moisture ingress will cause flickering within the first rain event.
Do Not Run at Full Brightness Continuously
Running a long light run at 100% brightness continuously generates the most heat and electrical stress. Using 85–90% brightness provides nearly identical visual output with significantly less thermal and electrical stress on the system.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If flickering only happens on dimming, the issue is almost always the dimmer's minimum-load setting, not the bulb — it's drawing less current than the dimmer expects.
Reduce the affected zone to 70% brightness and observe whether flickering stops. Significant improvement at lower brightness confirms a voltage drop or overloaded port rather than a hardware failure in the LED track itself.
LED flicker with smart dimmers is the #1 unfixed complaint — most people swap the bulb when the dimmer's low-end trim is the actual problem.
- Loose wire connection at the controller port or at
- Voltage drop on a long wire run — sections
- Moisture intrusion at a connector or wire junction following
- Degraded or corroded inline connector from years of outdoor
- Overloaded controller port — too many light sections on
Before you go — try one of these (they fix most cases).
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Need More Help? JellyFish Lighting Support
Note: The contact information below connects you directly to JellyFish Lighting's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.