LED strip width: choose the PCB size from the channel and connection

CHECKPOINT / 01

Measure the complete installation envelope

The PCB width is only the first dimension. Measure the profile inner width, diffuser lips, coating, solder joint, connector, cable exit and bend clearance. For a furniture groove or corner channel, also measure the tools needed to install and repair the strip. A board that fits before wiring may fail once the joint and strain relief are included.

• Record clear width and height at the tightest point.
• Check whether the channel accepts the coated or sleeved version you selected.
• Leave enough room to remove the diffuser and pull a service lead.

CHECKPOINT / 02

Width affects the thermal path

A wider board can provide more copper area or support a particular emitter layout, but width alone does not prove output or efficiency. Compare watts per metre, density, copper construction, mounting surface, ambient temperature and diffuser together. A narrow high-density strip can still need heat spreading, while a wide low-power board can be a better fit for a protected detail.

• Treat package size, board width and LED density as separate fields.
• Do not choose a wide strip only because it looks brighter in a product photo.
• Use the selected profile or mounting surface to carry heat when the load requires it.

CHECKPOINT / 03

Choose width from the light job

Narrow strips are useful for tight furniture, shelving and small channels. Standard-width boards often offer more connector and diffuser choices. Wider or multi-row boards may suit higher output or a broad optical line when the channel has the space. These are starting categories, not performance promises; the exact voltage, cut interval, power and light engine still control the selection.

• Furniture detail: prioritize the full fit and bend direction.
• Visible linear light: compare density, diffuser depth and glare at the real sightline.
• High-output task light: verify output and temperature at the intended drive level.

CHECKPOINT / 04

Check connectors, cut marks and channel ends

The connector must match the strip width, pin count, current and polarity. A wide strip may need a larger terminal while a narrow strip may have less copper for a solder joint. Confirm the cut interval and wire exit before ordering the channel length, and leave room for a connector or soldered lead at the end. Do not let the cover pinch a raised joint.

fit_width = board + coating + connector_clearance
thermal_check = watts_per_m + mounting_surface + ambient
approve = fit_width <= channel_clear_width && thermal_check

CHECKPOINT / 05

Approve a sample at the final sightline

Install a short piece of the selected width in the actual profile, diffuser and surface finish. Test the desired brightness, color or CCT, inspect the first and last section, and remove the cover to confirm service access. Keep the final record with width, voltage, density, power, cut interval, connector and channel so a replacement strip does not have to be chosen from a photograph.

• Judge output and uniformity after the diffuser is installed.
• Measure voltage at the strip when the planned maximum state is active.
• Keep an offcut or cross-section record when future replacement is likely.

FAILURE MODES

What usually goes wrong

• The bare PCB fits but the coating or solder joint does not.
• Width is used as a shortcut for brightness, CRI or lifetime.
• A connector is selected by visual size without checking pin order and current.
• The channel is ordered before the cut interval and cable exit are known.
• The sample is checked without the final diffuser, so glare and hotspots appear after installation.

TECHNICAL BASIS / VERSION

Keep the decision current

This guide is maintained as a versioned technical record. Recheck the current protocol documentation and the exact product revision before using it in a production installation.