{"id":1273,"date":"2026-02-07T14:44:16","date_gmt":"2026-02-07T06:44:16","guid":{"rendered":"https:\/\/glowinled.com\/how-inquire-about-dual-ended-power-supply-long-distance\/"},"modified":"2026-02-06T15:09:52","modified_gmt":"2026-02-06T07:09:52","slug":"how-to-specify-dual-feed-led-strip-for-long-distance-projects","status":"publish","type":"post","link":"https:\/\/glowinled.com\/fr\/how-to-specify-dual-feed-led-strip-for-long-distance-projects\/","title":{"rendered":"Comment sp\u00e9cifier une bande LED \u00e0 double alimentation pour des projets de longue distance ?"},"content":{"rendered":"

\n \"Dual-ended\n<\/p>\n

I often see clients frustrated when their carefully designed 20-meter light runs fade visibly at the far end, ruining the visual consistency of a high-end lobby or exterior facade. We test every batch in our aging room, and we know that simply asking for \"dual-ended power\" isn't enough to guarantee uniform brightness; you need to understand the underlying physics of the strip itself.<\/p>\n

To effectively inquire about dual-ended power supply, specify your total run length, voltage preference (24V or 48V), and dimming requirements. Ask suppliers for voltage drop data at both ends voltage drop<\/a> 2<\/a><\/sup> and confirm if the strip's internal copper thickness supports the current load required for dual injection without overheating.<\/strong><\/p>\n

Let\u2019s break down the technical details you need to discuss with your supplier to ensure a flawless installation and avoid common pitfalls.<\/p>\n

Will dual-ended power feeding eliminate voltage drop in my long LED runs?<\/h2>\n

It is disappointing to install premium lighting only to see the far end looking dimmer than the start, creating an unprofessional gradient effect. When we engineer custom PCBs for large-scale commercial projects, we often remind clients that feeding power from both ends is a helpful technique, but it is not a magic wand for poor circuit design.<\/p>\n

Dual-ended power feeding significantly reduces visible [voltage drop](https:\/\/glowinled.com\/how-to-evaluate-voltage-drop-in-led-strips-after-prolonged-use\/ \"voltage drop\") but does not completely eliminate it. It equalizes voltage distribution, ensuring the middle section remains bright. However, without sufficient copper thickness on the PCB, resistance will still cause dimming or overheating, even with power injected at both ends.<\/strong><\/p>\n

The Science Behind the Voltage Drop<\/h3>\n

When you ask a supplier about dual-ended power, you are essentially asking about current distribution. In a standard single-end feed, the voltage is highest at the injection point and drops progressively as it travels down the copper traces of the Flexible Printed Circuit (FPC) Flexible Printed Circuit<\/a> 3<\/a><\/sup>. By the time the current reaches the LEDs at the end of a long run, the voltage may be insufficient to drive them at full brightness.<\/p>\n

Dual-ended feeding (injecting power at both the head and tail of the strip) attacks this problem from two sides. Ideally, the voltage meets in the middle. However, the success of this method depends entirely on the internal structure<\/strong> of the LED strip, specifically the copper weight.<\/p>\n

Why Copper Weight Matters More Than Wiring<\/h3>\n

Many buyers assume that connecting wires to both ends solves the problem. It does not. If the FPC is too thin\u2014say, using 1 ounce (oz) of rolled copper instead of 2oz or 3oz\u2014the internal resistance remains high internal resistance<\/a> 4<\/a><\/sup>.<\/p>\n

When we design strips for long runs, we increase the [copper thickness](https:\/\/glowinled.com\/how-to-verify-copper-thickness-standards-in-high-density-dotless-cob-led-strips\/ \"copper thickness\"). If you force current into both ends of a thin strip, you might get better uniformity, but you also risk heating up the FPC because the \"road\" (copper trace) is too narrow for the \"traffic\" (current). This heat degrades the LED chips and the adhesive backing over time. Therefore, your inquiry must go beyond \"Can I feed both ends?\" to \"Is the PCB designed to handle the current of a dual-feed setup?\"<\/p>\n

Voltage Drop Comparison Data<\/h3>\n

We simulated the performance of a standard 24V LED strip versus a high-copper version to illustrate why the strip quality dictates the success of dual-feeding.<\/p>\n\n\n\n\n\n\n\n\n
Power Feed Method<\/th>\nPCB Copper Weight<\/th>\nVoltage at Start (0m)<\/th>\nVoltage at Middle (5m)<\/th>\nVoltage at End (10m)<\/th>\nVisual Result<\/th>\n<\/tr>\n<\/thead>\n
Single-Ended<\/strong><\/td>\n1 oz (Standard)<\/td>\n24.0V<\/td>\n22.1V<\/td>\n20.5V<\/td>\nVisible dimming at the end.<\/td>\n<\/tr>\n
Single-Ended<\/strong><\/td>\n3 oz (Premium)<\/td>\n24.0V<\/td>\n23.2V<\/td>\n22.4V<\/td>\nSlight dimming, barely visible.<\/td>\n<\/tr>\n
Dual-Ended<\/strong><\/td>\n1 oz (Standard)<\/td>\n24.0V<\/td>\n22.5V (Lowest Point)<\/td>\n24.0V<\/td>\nCenter is dimmer; strip runs hot.<\/td>\n<\/tr>\n
Dual-Ended<\/strong><\/td>\n3 oz (Premium)<\/td>\n24.0V<\/td>\n23.6V (Lowest Point)<\/td>\n24.0V<\/td>\nPerfectly uniform brightness.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

As shown in the table, dual-ended feeding on a premium PCB yields the best result. When inquiring, ask your supplier for this specific data: \"What is the voltage at the center point of the run when powered from both ends?\" If they cannot answer, they may not have tested it.<\/p>\n

Can I request pre-soldered wires on both ends to speed up on-site installation?<\/h2>\n

Field soldering is a nightmare for contractors, especially when working on ladders or in damp outdoor conditions where moisture compromises the joint. We frequently customize orders by adding factory-sealed leads to our reels, saving installation teams hours of labor and preventing failures caused by cold solder joints or weak connections.<\/p>\n

Yes, requesting pre-soldered wires on both ends is a standard industry practice that reduces labor costs and improves reliability. Factory-soldered connections are typically machine-applied and heat-shrink sealed, offering superior water resistance and tensile strength compared to tensile strength<\/a> 5<\/a><\/sup> manual soldering performed at the installation site.<\/strong><\/p>\n

\"Pre-soldered<\/p>\n

Factory Precision vs. Field Risk<\/h3>\n

In our production facility, soldering is not just about making an electrical connection; it is about mechanical stability. When you inquire about dual-ended power, you should explicitly request \"factory-soldered fly leads\" on both ends of the reel.<\/p>\n

Manual soldering on-site is prone to error. An installer balancing on a scaffold may not apply enough heat, resulting in a \"cold joint\" that creates resistance and eventually sparks or fails. Furthermore, resealing a waterproof [IP67 or IP68 strip ](https:\/\/glowinled.com\/ip67-vs-ip68-led-strip-waterproof-guide\/ \"IP67 or IP68 strip \")on-site IP67 or IP68<\/a> 6<\/a><\/sup> is difficult. Once you cut the silicone sleeve to solder, it is hard to restore the original waterproof integrity.<\/p>\n

Customizing the Lead Length<\/h3>\n

A crucial part of your inquiry involves the length of these pre-soldered wires. Standard factory leads are often short (around 15-20cm). For a dual-feed project, this might be insufficient if your main power line is tucked away in a ceiling cavity or a driver box located meters away.<\/p>\n

We recommend specifying the exact length you need. For example, \"Please provide 50cm 18AWG leads on both ends.\" This prevents the installer from having to add another junction box close to the light, keeping the installation clean.<\/p>\n

Waterproofing and Connector Options<\/h3>\n

When inquiring, you should also discuss the type of termination. It is not just about bare wires.<\/p>\n