There’s No Universal Wiring Diagram for Long Chandeliers

Every time I get a call from a client who’s bought a long chandelier and a Mean Well driver, the question starts the same: “Can you just send me the wiring diagram?”

I used to send one generic diagram. Then I stopped, because nobody got the result they expected. The truth is, wiring a Mean Well LED driver for a long chandelier depends on at least three variables:

  • Do you need dimming? And if yes, what type?
  • Is the chandelier wired with a 2-way (3-wire) switch?
  • How long is the cable run between the driver and the fixture?

In my role coordinating lighting retrofits for commercial projects, I’ve seen too many installations fail because someone followed a ‘universal’ diagram they found online. So let me break it down by the three most common scenarios we’ve handled at our company. Two of them include a 2-way switch wiring. One does not.

Scenario A: No Dimming, Simple 2-Way Switch (Most Common)

This is the straightforward one. You have a Mean Well LPC-60 series driver (constant current) or LRS-150-24 (constant voltage 24VDC), and the chandelier uses standard wall switches with a 2-way (3-wire) setup.

The wiring: The 2-way switch connects the mains L and N to the driver input. The driver output (V+ and V-) goes directly to the LED strip or module inside the chandelier. No dimmer in between.

What most installers miss: voltage drop over a long cable run. If your chandelier is 3 meters long and the driver is located in a ceiling junction box 5 meters away, you lose about 1–1.5V at 24VDC with 18 AWG wire. Suddenly your LEDs are 10% dimmer than expected.

“The question everyone asks is ‘what’s the wire gauge?’ The question they should ask is ‘what’s the actual voltage at the last LED chip after 8 meters of cable?’”

Our fix: we use 16 AWG or parallel two 18 AWG wires for runs over 10m. Also, choose a Mean Well driver with voltage adjustment (like the LRS-150 series) so you can tweak it to 24.5V if needed.

Scenario B: Dimmable Long Chandelier with 2-Way Switch (The Tricky One)

This is where most people get burned. You want dimming on a long chandelier controlled by two switches (e.g., one at each end of a hallway). The complication: you cannot simply put a standard wall dimmer on a 2-way circuit without changing the switch wiring.

Mean Well’s 3-in-1 dimming (resistor/PWM/voltage) is a lifesaver here, but only if you wire it correctly.

The correct approach: Forget placing a dimmer at the wall. Instead, use a 0-10V dimming Mean Well driver (like the LPC-60H series) and run a separate low-voltage dimming wire from the driver location to a dimmer control that sits after the 2-way switch. Keep the 2-way switch only for on/off.

Last year we had a job for a boutique hotel: 3-meter chandeliers in a long corridor, each with dimming. The client had already bought standard trailing-edge dimmers and wired them into the two-way circuit. It flickered like crazy. We had to rip out the wall switches and rewire—cost them $2,000 in extra labor.

“The vendor who said ‘this isn’t our strength – here’s who does it better’ earned my trust for everything else.”

I honestly felt bad for not warning them earlier. Now I always ask: “Do you want dimming? If yes, then you cannot use a simple 2-way dimmer. Use our 3-in-1 driver with a remote dimming control.”

Resistor range for 3-in-1 dimming: Mean Well specifies a 100kΩ potentiometer for resistor dimming. We always use a B100K linear pot wired between DIM+ and DIM- terminals. For PWM, keep frequency between 100Hz and 1kHz.

Scenario C: No 2-Way, Only One Switch, But Long Chandelier with Multiple Drivers

Sometimes the chandelier is so long (4-5 meters) that a single driver cannot power it. You need two Mean Well drivers – one for each half.

This is where the ‘expertise boundary’ comes in. I’m not a lighting designer, but I’ve done enough of these to know that parallel-driving from a single switch requires careful synchronization. If one driver has a slightly different output voltage, half the chandelier will be brighter than the other half.

What works: Use two identical Mean Well drivers of the same lot number (same factory calibration). Wire them both to the same AC input (through one switch). Connect the output terminals separately to each section of the chandelier. Do not parallel the outputs unless the driver specifically supports it (most don’t).

In March 2024, a client needed a 5-meter chandelier for a lobby within 48 hours. Normal lead time for a single driver that could handle that length? 3 weeks. We split the load across two LPC-100-700 drivers, tested them side by side on the bench, and achieved <2% brightness difference. It worked.

Caution: If the chandelier has individual LED modules with different color temperatures on each half, you’re better off consulting a lighting engineer. This is where I say: “This is beyond what I can guarantee—let me recommend a specialist.”

How to Decide Which Scenario Applies to You

Here’s a quick checklist I use when I’m on the phone with a client:

  1. Q: Do you need dimming? — Yes → Scenario B. No → Scenario A or C.
  2. Q: How many switches control the chandelier? — Two or more → Scenario B (with proper wiring). One → Scenario A or C.
  3. Q: Total length of LED strips inside the chandelier? — More than 5m → Scenario C. Under 5m → Scenario A.
  4. Q: Do you have existing 2-way dimmer switches already installed? — Yes → STOP. Remove them. Use Scenario B method.

I’m not saying I’m the smartest person in the room. I’m saying that after 80+ rush orders for chandelier installations, I know that a generic diagram is a trap. Mean Well makes excellent drivers, but they can’t fix bad wiring decisions.

Bottom line: pick your scenario, follow the advice, and test the setup before final mounting. That saved me more than once.