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Those who have worked on long-line light strip projects have all encountered the same problem:
- The front end is very bright and gets darker as you move further back.
- Inconsistent colors; White light is yellowish.
- Even flickering occurred. This is a typical Voltage Drop.
If your project is long-distance linear lighting of 10m, 15m, 20m or more, instead of constantly adding electrical points and thickening the wire diameter, it is better to directly choose the solution that is more suitable for long-distance lines — Long Run Constant Current LED Strip.
This article will explain in the most intuitive way:
What is a constant current light strip? Why can it achieve 24V 20 meters without voltage drop? And how to choose between white light, RGB and RGBW.
Constant-Voltage vs Constant-Current LED Strips
Why LED Strips Get Dim on Long Runs？
Most traditional LED light strips adopt a Constant Voltage (CV) power supply mode, that is, the power supply provides a fixed voltage (such as 12V or 24V), and the LEDs are connected in the circuit through a combination of series and parallel connections. However, in long-distance applications, this design has obvious limitations:
- As the LED strip gets longer, the copper traces and wires add resistance, which causes a voltage drop. The voltage is highest near the power supply and gradually decreases toward the far end.
- Because LED brightness depends on current and current depends on voltage, the LEDs at the end receive less voltage, so their current drops. As a result, the far end becomes dimmer, colors may shift, “white” can look yellowish, and flicker may appear under high load.
PCB width and copper matter more than most people think on long runs. See our LED strip width guide for how width impacts current handling, heat, and real-world performance.
3 Quick Fixes for Voltage Drop
The core design concept of Constant Current (CC) LED strips is to stabilize the current rather than the voltage.
- In each LED unit (or each group of LEDs) of the light strip, a dedicated constant current driver IC is integrated.
- These chips dynamically regulate the local drive to compensate for line losses. Even if the input voltage drops along the run, they adjust the local voltage so the LED current stays constant.
- Because LED brightness is determined by current, stable current means stable brightness, so the light output remains uniform despite voltage fluctuations.
Why Constant-Current Helps Keep Brightness More Even？
Thanks to the above-mentioned technology, constant current LED light strips can support continuous installation of a single section up to 20 meters in length without the need for mid-process power addition or segmented power supply.
- The brightness at the beginning and the end is highly consistent
- The color reproduction is accurate without any deviation
- Simplify wiring to reduce system complexity and cost
When “Up to 20m” Really Matters？
There are three things that Long-distance light strips fear the most:
- Uneven brightness: The lines appear “layered and gradually darkening.”
- Inconsistent color: Especially RGB mixed with white, the end is more likely to be yellowish or color-biased
- Inconsistent dimming: When dimming, the end “loses light” first, resulting in a very poor effect
The constant current light strip in the poster features a 24V power supply and 20 meters of no voltage drop, which makes it suitable for creating a more consistent and “high-end” linear visual effect. For engineering installation, it means:
- Fewer charging points
- The wiring is more simplified
- The effect is more uniform and the rework rate is lower
Recommended products for long runs
- 48V LED Strip is a simple way to reduce current and voltage drop over long distances
- High Efficiency LED Strip can lower power draw for more stable long runs and cooler operation
How to Choose: White vs RGB vs RGBW for 24V Long-Run Lighting
①24V constant current white LED strip (suitable for linear lighting)
Parameters: 8W/ m, 120LEDs/ m, 10mm PCB, 120° emission Angle; CRI is available in 80/95 options.
Dimming: Common DC24V PWM dimming systems/dimmers (such as RF, 0-10V, DALI, DMX512, etc.) can be used.
Color temperature options: support 1800 k / 2700 k / 3000 k / 4000 k / 5000 k / 6000 k (customizable).
If you are working on projects such as corridors, ceiling light troughs, cabinet lighting, and linear contours that are mainly based on white light, give priority to the white light version.
Advantages
- The light is cleaner and the visual effect is more unified
- Making long lines is more likely to achieve the effect of “consistency throughout the entire line.”
- Simpler control and higher stability
② 24V constant current RGB light strip (suitable for pure color atmosphere)
Parameter: 8W/ m, 72LEDs/m, 120° emission Angle; Board width: 10mm; CRI: 80/95 is optional.
If your requirements are for colored scenes, ambient lights or decorative lights, the RGB version is more economical.
Advantages
- Rich in color effects
- It supports atmosphere gameplay such as scene switching, color change, and gradient.
Note: The “white light” of RGB is mixed colors, and the texture and consistency of white light are usually not as good as those of RGBW.
Application: bars, KTVS, e-sports rooms, decorative edge lines, and stage edge atmosphere.
③ 24V constant current RGBW light strip (both color and “true white light”)
Parameter: 10W/ m, 72 LEDs /m; Board width: 12mm; CRI: 80/95 is optional.
If you want the same light strip to not only create a colorful atmosphere but also be used as a daily white light (especially when a more natural white light is needed), it is recommended to directly choose RGBW.
Why is RGBW more advanced?
- An independent W white light channel has been added
- White light is purer, and light color gradients are softer
- More suitable for “multi-scenario” Spaces: work, rest and atmosphere all in one
Application: exhibition halls, hotels, living rooms, stores, and projects that require both white light and color light.
Even with constant current, temperature can change efficiency and long-term stability—especially in enclosed channels. Here’s a real case study on how ambient temperature affects LED working temperature.
Benefits of Constant-Current LED Strips for Long Runs
Dimming on Long Runs: How to Avoid Flicker & Uneven Brightness
When many ordinary light strips are used over long distances, dimming will occur:
- The front end is still bright, but the end has darkened first
- The brightness distribution is uneven, like “light cut-off”.
The constant current structure is more friendly to long-line dimming, which makes it easier to achieve simultaneous lighting and dimming of the entire light strip, resulting in a more unified visual effect.
120° Beam Angle: What It Changes in Channels and Diffusers
The 120° beam Angle given on the poster belongs to the commonly used wide-angle light emission of light strips, in combination with:
- Diffusion hood
- Light slot/light strip profiles
It can achieve more uniform linear light output, reduce graininess and hotspots, and is suitable for projects that pursue “advanced line light.
Installation Tips: Wiring, Power Supply, and Connectors
Even for constant current light strips, it is recommended that you do the following to make the overall performance more reliable.
- Choose a 24V power supply with stable quality and leave sufficient margin (do not load it fully)
- The connection points should be welded or made with high-quality joints as much as possible to avoid loosening and causing flickering
- It is recommended to use aluminum grooves for heat dissipation, which results in less light attenuation and a longer lifespan
- The route planning should be clear to facilitate later maintenance
Planning a long run outdoors? IP rating is only part of it, mounting, sealing, and cable routing make or break reliability.