COB LED Strip 320 LEDs/m
Cost-optimized COB strip for projects that need a smooth light line at a balanced price point.
8W/m · DC24V · IP20 / IP65
Troubleshooting
Cut an LED strip and only part of it lights up — what did I do wrong?
Two mistakes cause 90% of this: cutting on the wrong mark, and wiring a reel from both ends by mistake.
What we need to confirm it
- How many LEDs per metre, voltage, where you cut, which portion is dark?
Diagnosis
Cause, then fix
Cut on the wrong mark
Every reel has a scissor mark at a fixed pitch (e.g. every 25 mm on DC24V 8 LEDs/cut). Cut anywhere else and you sever a trace, so the cut segment drops out.
Fix: Always cut on the printed scissor mark, centred between two solder pads.
Cut point is at the very ends
The first and last LED of a reel are fed from the tail; cutting 10 mm in removes one supply path.
Fix: Keep the first and last 100 mm intact or re-connect the tail properly.
Polarity reversed on re-joining
Strips are DC. + to - reversed means nothing lights, or only a few LEDs before protection.
Fix: Match + to + and - to -. On 2-pin connectors there is no polarity protection; get it right the first time.
Virtual junction wired wrong
Mid-run connections need both power in and the cut jump (2 pins) plus the through-link (2 pins). Missing the jump breaks the far half.
Fix: On a cut mid-reel: jump the two pads, then feed power to the same point. Do not rely on the connector to carry power across.
Spec that avoids this
Strips used to build it properly
SMD2835 LED Strip 120 LEDs/m
High-efficiency SMD2835 strip — the most widely used solution for linear general lighting in commercial and residential projects. Available in 60 / 120 / 180 LEDs/m versions.
9W/m (120 LEDs/m); 5W/m (60 LEDs/m); 18W/m (180 LEDs/m) · DC12V · IP20 / IP44 / IP65 (IP68 with silicone sleeve on request)
Pick a strip that will not do this
Tell us the run and the driver you already have. We quote a combination that is compatible, not just cheap.