LED strip light several meters need to fill a power

There is no single distance at which every LED strip needs another power feed. The correct interval depends on voltage, watts per metre, PCB resistance, cable size and the maximum acceptable brightness or color change.

What voltage drop looks like

Current flowing through the PCB and supply cable causes voltage loss. The far end may become dimmer; RGB strips can also shift color because channels do not drop equally. Measuring only at the power supply can therefore hide the problem.

How to plan feed points

1. Calculate total watts: length × watts per metre.
2. Convert watts to current using current = watts ÷ voltage.
3. Check the manufacturer's maximum recommended continuous feed length.
4. Calculate cable voltage drop for the actual route.
5. Feed from both ends or add parallel injection points where required.

Do not connect two power supplies together on the same positive output unless the system is specifically designed for current sharing. Multiple sections can share control signals while their power wiring remains correctly isolated.

12 V versus 24 V

For equal power, a 24 V strip draws half the current of a 12 V strip and is often easier to use on longer runs. It does not eliminate voltage drop, and pixel products may have different requirements. Compare options in our LED strip voltage guide.

Practical checks

• Measure voltage at the beginning and end under full load.
• Use adequately sized copper cable and protected connections.
• Fuse branches where required by the design.
• Keep drivers ventilated and accessible.
• For RGB/RGBW, test with all channels at maximum output.

Use our power-supply sizing guide and consult the SMD LED strip specifications for watts per metre and permitted run lengths.

Frequently asked questions

Can I inject power at the middle?

Yes, if polarity and circuit loading are planned correctly.

Does thicker wire fix every long run?

It reduces cable loss but does not remove voltage drop along the strip PCB.

Why is the end a different color?

Unequal channel voltage drop is a common cause on RGB and RGBW strips.