Series wiring LED marker lights is very different from connecting standard 12V or 24V constant voltage lighting. Many recessed LED marker lights, including models from ALL LED, require a 350mA constant current LED driverand must be connected in series.
These fittings may consume only 1W each, but incorrect wiring can cause permanent and costly damage. Connecting series-rated LED lights in parallel, using an unsuitable driver or making connections while the driver is energised can damage individual LEDs or potentially several fittings at once.
IMPORTANT WARNING – ONE MISTAKE CAN DESTROY MULTIPLE LED LIGHTS
Never connect series-rated 350mA LED marker lights in parallel or directly to a 230V mains supply.
Never connect or disconnect LED fittings while the driver is powered.
Incorrect current, unsuitable driver selection or improper electrical connections can permanently damage integrated LED modules. In some installations, a single mistake may result in several fittings needing replacement.
Always isolate the electrical supply, verify it is dead, complete and inspect every connection, and confirm driver compatibility before switching on.
What Does Series Wiring Mean for LED Marker Lights?
In a series wiring LED marker lights installation, compatible fittings are connected end-to-end, forming one continuous electrical path between the positive and negative outputs of the constant current LED driver.
For example, when connecting three compatible 350mA marker lights, the driver supplies the same regulated current through each LED fitting in sequence.
In a correctly designed series circuit:
- The same current flows through every LED fitting.
- The constant current driver regulates the current, commonly 350mA for many ALL LED marker lights.
- The required output voltage is the sum of the forward voltages of the connected LEDs.
- The total LED load must remain within the driver’s specified minimum and maximum output voltage and power limits.
- Every fitting must be suitable for the selected driver and wiring arrangement.
Important distinction: If one LED fails open-circuit or a connection becomes disconnected, the entire series circuit may stop illuminating. This does not automatically mean every LED has been destroyed. However, incorrect driver current, wiring mistakes or reconnection while powered can cause irreversible damage.
For suitable fittings and drivers, series wiring is the correct method of installation, not an optional preference.
Why Series Wiring LED Marker Lights Require Constant Current Drivers
Series-wired LED marker lights are current-controlled, not fixed-voltage lighting systems.
Unlike conventional 12V or 24V constant voltage lighting, these fittings require a constant current LED driver matched to the manufacturer’s specified operating current.
Common ratings include:
- 350mA – commonly used for compact 1W marker lights, step lights and recessed architectural lighting.
- 700mA – used for certain higher-output LED fittings specifically designed for this current.
A constant current driver regulates the current flowing through the connected LEDs and automatically adjusts its output voltage within its rated operating range.
Why Does the Correct Driver Matter?
The driver’s output current must match the LED manufacturer’s requirements.
For example, a marker light designed for 350mA must not be connected to a driver set to 700mA. Excessive current can cause overheating, rapid LED degradation or immediate permanent damage.
The driver must also support the total voltage and power requirements of every fitting connected in series.
Important: A driver rated at 1–11W is not automatically suitable for every combination of 1W LEDs. Its minimum and maximum output voltage must also be checked.
Before installation: Confirm the LED current rating, driver output range, number of fittings and wiring arrangement. Never assume that matching the wattage alone guarantees compatibility.
Important Warning: Parallel Wiring Can Permanently Damage LED Marker Lights
Connecting LED marker lights designed for series wiring in parallel to a constant current driver can cause uneven current distribution and permanent LED damage.
In a parallel circuit, the current may not divide equally between individual LED fittings. Differences in their electrical characteristics can cause some LEDs to receive excessive current, even when the driver’s total output is regulated.
What Can Go Wrong?
- Unequal current distribution – some LED fittings may receive more current than others.
- Overheating – excessive current can increase the LED junction temperature.
- Uneven brightness – some lights may appear brighter or dimmer than others.
- Premature failure – overstressed LEDs may deteriorate significantly faster.
- Permanent damage – one or more integrated LED modules may fail and require replacement.
Even if the lights initially appear to work, this does not mean the installation is electrically correct. Internal damage may already be occurring.
IMPORTANT: INCORRECT WIRING VOIDS THE MANUFACTURER’S WARRANTY
Damage caused by incorrect installation, unsuitable drivers or failure to follow the manufacturer’s wiring instructions may not be covered by the product warranty.
How to Wire LED Marker Lights in Series (Correct Method)
For LED marker lights designed to operate at 350mA constant current, each fitting must be connected in series, following the manufacturer’s wiring instructions.
Step-by-Step Installation
- Isolate the power supply and verify that the circuit is dead before starting any electrical connections.
- Check the LED driver specification. Confirm that its output current matches the fittings, typically 350mA for many ALL LED marker lights.
- Connect the driver’s positive (+) output to the positive (+) connection of the first LED fitting.
- Connect the first LED’s negative (−) connection to the positive (+) connection of the next fitting.
- Continue connecting the fittings end-to-end, maintaining the correct polarity throughout.
- Connect the final LED’s negative (−) connection to the driver’s negative (−) output.
- Inspect every connection before switching on. Confirm the wiring arrangement, polarity and driver compatibility.
Important Checks Before Switching On
- Every fitting must be compatible with the driver’s regulated output current.
- The combined LED forward voltage must fall within the driver’s specified operating voltage range.
- The total connected load must remain within the driver’s power rating.
- Complete all LED connections before energising the driver.
- Never connect or disconnect LED fittings while the driver is powered.
CRITICAL: DO NOT MAKE LIVE LED CONNECTIONS
Some constant current drivers can develop a high output voltage when operating without a connected load. Connecting an LED to an energised driver may subject it to a damaging transient.
Always switch off and isolate the driver before connecting, disconnecting or changing LED fittings.
Professional installation: Electrical work should be carried out by a competent person in accordance with the manufacturer’s instructions and applicable electrical regulations.
Common Installer Mistakes to Avoid
❌ Assuming all low-voltage lights can be wired in parallel
❌ Using a 12V or 24V constant voltage power supply
❌ Mixing 350mA and 700mA fittings on one circuit
❌ Adding extra lights without recalculating total voltage
Marker lights may look similar externally, but their electrical requirements can be very different.
Best Practice Before Installation
Before installing any marker lights:
✔️ Read the manufacturer’s instructions
✔️ Confirm whether series wiring is required
✔️ Match the correct constant current driver
✔️ Verify the current rating (350mA or 700mA)
✔️ Calculate total circuit voltage
Never assume wiring method based on appearance alone.
Leave a Reply