12V vs 24V LED Neon — Which Voltage Should You Choose?
12V vs 24V LED Neon — Which Voltage Should You Choose?
Choosing the supply voltage for an LED neon is not a matter of style — it is a technical decision that affects installation length, costs, lighting uniformity and safety. The most common dilemma faced by customers is whether to go with 12 V DC or 24 V DC. Both values belong to the SELV (Safety Extra Low Voltage) class and are fully safe to touch, but each has its own use case. In this article we explain when 12 V is the right choice and when to opt for 24 V — based on real parameters such as voltage drop, installation length and power draw. We also show why the 230 V AC mains never feeds an LED neon directly.
Why LED neons do not run on 230 V AC
LED diodes are low-voltage DC components. A single LED typically lights up at 2-3 V DC, and in neon strips they are wired in series-parallel groups totalling either 12 V or 24 V DC. The mains in Poland delivers 230 V AC (50 Hz) — this requires conversion by the LED driver, which fulfils three functions:
- AC → DC conversion — rectifying alternating current into direct current
- Voltage step-down — from 230 V to 12 V or 24 V
- Galvanic separation — isolating the LED circuit from the 230 V mains (SELV class)
That is why EN 60598-2-23 covers SELV-powered luminaires as a separate category — the LED neon is a low-voltage device and the driver acts as a protective buffer.
12 V DC — characteristics and applications
12 V DC is the historic standard in the LED industry — inherited from automotive electronics and the cheapest manufacturing option. 12 V drivers are widely available and components (RGB controllers, remotes, individual diodes) are relatively inexpensive.
Advantages of 12 V in LED neons:
- Lower cost of driver and components — typically 10-15% cheaper than 24 V
- Full SELV safety — voltage well below the threshold of perceptible electric shock
- Easy diagnostics — simple multimeter measurements, option of backup power from a car battery
- Rich accessory ecosystem — controllers, dimmers, connectors available in many variants
Disadvantages of 12 V:
- Higher voltage drop in long installations (cable-resistance effect)
- Higher current for the same power — a 100 W neon at 12 V draws 8.3 A, at 24 V only 4.2 A
- Larger cable cross-section required for long runs
- Practical length limit around 10 metres per single driver
24 V DC — characteristics and applications
24 V DC is the preferred standard for longer installations and professional scenarios. Higher voltage reduces current (per Ohm’s law) and allows a greater neon length to be fed from a single point without visible brightness drop at the end of the run.
Advantages of 24 V in LED neons:
- Lower voltage drop — effectively 2× longer range from a single driver
- Lower current — smaller heat losses on connections, solder joints and contacts
- Thinner power cables — a smaller conductor cross-section is sufficient for the same power
- Better current efficiency — on long runs less energy is lost to resistance
- More uniform light output — no “dimming” effect at the end of a long neon
Disadvantages of 24 V:
- Higher cost of driver and components
- More advanced RGB / Wi-Fi controllers required — must handle the full voltage range
- Less commodity standardisation for retail accessories (although in professional LED neons it is the manufacturer standard)
Voltage drop — the key technical difference
Every metre of supply cable has a defined resistance (typically 0.01-0.03 Ω/m for a 2×0.75 mm² cable). The current flowing through the cable produces a voltage drop (U = I × R). For the same power flow, lower voltage means higher current — and a greater voltage drop over the same cable length.
| Neon length | Voltage drop 12 V | Voltage drop 24 V | Conclusion |
|---|---|---|---|
| 3 m | ~3% | ~1.5% | Both safe |
| 5 m | ~5% | ~2.5% | Both safe |
| 10 m | ~10% | ~5% | 12 V practical limit |
| 15 m | ~15% (visible unevenness) | ~7.5% | 12 V unacceptable, 24 V OK |
| 20 m | ~20% (unacceptable) | ~10% | Only 24 V with dual-end feeding |
At 12 V, the voltage drop reaches around 10% after 10 metres — which in practice means the end of the neon glows visibly dimmer than the start. For comparison, at 24 V after 10 metres the drop is about 5% — a brightness difference imperceptible to the eye.
12V vs 24V — direct comparison
| Parameter | 12 V DC | 24 V DC |
|---|---|---|
| Safety class | SELV — safe | SELV — safe |
| Maximum practical length | ~10 m | ~20 m |
| Voltage drop over 10 m | ~10% | ~5% |
| Current for 100 W | 8.3 A | 4.2 A |
| Recommended cable cross-section | 2×0.75-1.0 mm² | 2×0.5-0.75 mm² |
| Driver cost | Lower | Higher (+10-15%) |
| Ideal application | Small signs, logos, decoration | Long signage, facades, strip lighting |
| Battery-powered operation | Yes (12 V battery) | Yes (with step-up converter) |
Practical scenarios — what to choose
Wall-mounted neon at home / in a room
Typical dimensions: 50-200 cm in length. 12 V DC is sufficient. Voltage drop below 3%, minimal cost, full compatibility with standard RGB controllers and remotes. Ideal for single sign words (“LOVE”, “OPEN”, a company logo above a desk).
Restaurant / shop logo above the entrance
Typical dimensions: 1.5-3 m of neon length. Both voltages work correctly, but for logos longer than 2 m we recommend 24 V DC — uniform light output and better resistance to momentary mains voltage drops.
Facade sign with a long inscription
Typical dimensions: 4-10 m. Absolutely 24 V DC — or with dual-end 12 V feeding from both ends (complex, requires experience). For professional facade signage we use 24 V as a default standard across our product range.
Architectural facade illumination
Long strips 10-30 m. 24 V DC with segmented feeding — several drivers strategically placed every 5-10 m. For premium projects we suggest a consultation with our technical team via the tailor-made neon form.
Portable / event neon
Mobility, option for battery power. 12 V DC — can be connected to a car battery or 12 V power bank. The most common choice for weddings, birthdays and other events.
The myth “higher voltage = more dangerous”
Some customers worry about 24 V, believing it is “closer” to the 230 V from the wall socket. This is a misconception. The threshold of perceptible electric shock is around 50 V DC (for dry skin, normal conditions) — both 12 V and 24 V sit far below this threshold. Both meet the SELV standard and are safe even in direct contact.
For comparison: 230 V AC exceeds the threshold of lethal electric shock. That is why the LED driver is an absolutely critical safety element — it galvanically isolates the low-voltage circuit from the mains.
FAQ — questions about LED neon power supply
Can I connect a 24 V neon to a 12 V driver?
No — the neon will not light up or will glow very weakly. Each LED module is designed for a specific voltage, and any change would require rebuilding the circuit (adjusting the number of diodes in the series group). Trying to run a neon at half its rated voltage will not damage it, but the visual result will be unacceptable.
And the other way around — a 12 V neon on a 24 V driver?
This will destroy the neon instantly. LEDs running at twice their design voltage will burn out within seconds — power grows quadratically (P = U²/R), so 24 V on a 12 V circuit yields 4× the power, meaning overheating and combustion. Always check the driver parameters before first power-up.
What if my neon is 12 V but I want a 15-metre installation?
Possible solutions: (1) dual-end feeding (two 12 V drivers wired at both ends of the neon), (2) larger cable cross-section (going from 0.75 mm² to 1.5 mm² reduces drop by about 50%), (3) switching the neon model to a 24 V version. We most often recommend option 3 — it is the most durable technological choice.
Can a 24 V driver be plugged into a normal home socket?
Yes — all our drivers accept input voltage 100-240 V AC, 50/60 Hz. They work in Poland, the EU, the UK, the US, Japan. They connect to a standard 230 V AC socket with a standard mains plug.
How long does an LED driver last?
A typical branded driver has a service life of 50,000-100,000 hours (5.7-11.4 years of continuous operation). In practice the driver usually fails before the LEDs (which last 50,000+ h) and is the most common part replaced during service after several years. All components in our neons are covered by a 24-month manufacturer’s warranty.
Does 24 V require earthing / a PE conductor?
No — a class III (SELV) neon does not require a protective earth. The driver itself, on the 230 V side, may require PE (depending on the protection class of the driver enclosure), but the 12/24 V neon circuit is galvanically isolated and not subject to these requirements.
We will select the optimal supply for your project
For orders placed through our creator, the system automatically selects voltage and driver based on the dimensions of your project. For larger jobs (shops, restaurants, facades) we recommend a consultation with our technical team — we will select 12 V or 24 V depending on length, curves, mounting method and power supply scenario.
We have been producing LED neons at our Wrocław factory (ul. Działdowska 32) since 1995 — 15,000+ projects delivered is our technical reference. Every project is engineered to real operating conditions: cable length, mounting location, expected brightness.
Get in touch: +48 731 08 00 00 or bok@fabrykaneonow.pl. For businesses please visit the B2B section. Standard lead time is 10 working days — with a full set of technical documentation and a valid CE declaration included.