What is the difference between 12v and 24v led module?

When you start planning a signage lighting project, one of the first questions that comes up is whether to use 12V or 24V LED modules. Both are low-voltage DC options widely used in channel letters, light boxes and sign cabinets, and both are safe and reliable. But they are not interchangeable. The voltage you choose affects how far you can run the wiring, how many modules you can connect to a single power supply, and how consistently the whole sign performs over time. This guide breaks down the real differences so you can make the right call for your project.

What is a 12V LED module?

A 12V LED module is a lighting unit designed to run on 12V DC power. Inside, the LEDs are usually arranged in small series groups of three, because a single white LED needs roughly 3V to light up. Three LEDs in series add up to about 9V, and a current-limiting resistor handles the rest. This simple, proven design is why 12V has become the industry standard for small and medium signage. It is widely available, inexpensive, and compatible with a huge range of power supplies and controllers. For small channel letters and short wire runs, 12 volt LED modules work perfectly and are often the most economical option.

What is a 24V LED module?

A 24V LED module works on the same principle but is designed for 24V DC. Because the voltage is doubled, the internal circuit can place more LEDs in series, typically six, which changes the electrical behaviour of the whole system. For the same power output, a 24V module draws only about half the current of a 12V module. Less current means less heat and, more importantly, far less voltage drop along the wire. That is why a 24V LED module is the preferred choice for larger signs, deep light boxes, and installations where the modules sit a long way from the power supply.

Key differences between 12V and 24V LED modules

The table below summarises the main differences you need to keep in mind when choosing between the two voltages.

Which one should you choose?

Choose 12V if you are working with small to medium channel letters, the wiring distance is short, and you want maximum compatibility with standard drivers and controllers. It is also the more budget-friendly starting point for simple projects.

Choose 24V if your project involves large channel letters or sign cabinets, light boxes with long runs, or multi-letter installations where you want to reduce the number of power supplies. Because 24V suffers less voltage drop, it also keeps brightness even across the whole sign, which matters for outdoor signage and large storefronts.

Practical installation tips

• Always match the power supply voltage to the module voltage. Running a 12V module on a 24V driver will damage the LEDs, while the reverse will leave them dim or unlit.
• Never mix 12V and 24V modules on the same circuit.
• Calculate the total wattage of the sign and choose a power supply with some headroom so it does not run at full load.
• For long runs, prefer 24V to reduce voltage drop, or add extra feed points to keep brightness uniform.

Conclusion

Both 12V and 24V LED modules have their place in signage lighting. 12V is the dependable standard for small signs and short runs, while 24V is the smarter choice for large installations where consistent brightness and long cable runs matter. Whichever you pick, buying from a reliable manufacturer makes the difference between a sign that lasts for years and one that fails early.

HansonLed is a professional LED module manufacturer with 13 years of production experience. We offer a full range of 12V and 24V LED modules for channel letters, light boxes and sign cabinets, with stable quality, competitive factory pricing, and OEM/ODM support for custom sizes, logos and colours. Contact our team to discuss your project, and we will help you choose the right module for the job.