A retrofit LED PCB has to fit the fixture before its electrical and thermal design can be evaluated. For tube and strip projects using flexible printed circuits, board thickness and panel dimensions are practical starting points—but they are not, by themselves, proof of thermal performance. WODE’s listed LED FPC specifications provide defined examples of thin PI constructions and panel formats. They do not state a thermal-conductivity value, so buyers should treat mechanical fit and heat-management qualification as separate checks.

That distinction matters when a project brief calls for a High Thermal Conductivity LED PCB. A flexible LED tube or strip circuit may solve packaging and routing constraints, while a separate thermal path or a different substrate construction may be needed to meet the fixture’s heat-management requirements. The right selection depends on the actual luminaire layout, the required finished circuit outline, and validation in the intended assembly—not on the word “FPC” or “high thermal conductivity” alone.

Why retrofit fit is more than matching a board outline

In a retrofit, the new circuit must work within an existing fixture envelope. The design review therefore needs to distinguish three dimensions that are easy to conflate: the FPC’s overall thickness, the manufacturing panel size, and the finished circuit length and shape required by the fixture. A listed panel dimension describes a manufacturing format; it does not automatically specify the final cut length of an installed tube or strip circuit.

Fixture geometry also affects how the circuit is supported, routed, and positioned relative to the light source and surrounding components. These are design checks rather than claims that a particular FPC will fit every luminaire. A buyer should compare the drawing for the finished part with the fixture’s available space and assembly method, then confirm the required outline and tolerances with the supplier.

WODE Circuit Technology (Zhuhai) Co., Ltd. supplies LED-related flexible circuit options that include a single-sided LED tube FPC and a single/double-sided LED strip FPC. The supplied specifications identify PI as the material for both. Their listed thicknesses and panel formats give project teams concrete starting points for an initial layout review, while leaving thermal performance and final fit to be established for the specific design.

Listed tube and strip FPC formats

These are listed product specifications, not a universal tube or strip design rule. The “ups” notation is retained as provided in the product data. The figures should be confirmed against the current manufacturing drawing and the buyer’s panelization or finished-part requirements before they are used in a production release.

How to use thickness in a fixture review

The listed tube FPC is 0.08 mm overall, while the listed strip FPC is 0.115 mm overall. That difference may be relevant when checking available clearance, bend paths, component placement, or how the circuit sits in an assembly. It does not establish that one option is thermally superior, more reliable, or suitable for a particular retrofit. No bending radius, dimensional tolerance, adhesive construction, or thermal-resistance result is stated in the supplied specifications.

For a project review, treat thickness as one input to the mechanical stack-up. Compare the stated overall thickness with the space available in the fixture, including any layers or mounting features that are part of the final assembly. If the design relies on the FPC conforming to a curved or narrow space, request the applicable design and assembly information rather than inferring a permitted bend from the thickness figure alone.

Layer configuration is another stated difference. The tube option is single sided; the strip option is available as single or double sided. A double-sided option can affect circuit layout decisions, but the supplied data does not establish that it is needed or preferable for a given retrofit. The decision should follow the electrical layout and manufacturing drawing, with the final configuration confirmed for the actual project.

Panel size is a manufacturing reference, not the finished length

Length-sensitive retrofits need careful interpretation of the panel data. The listed tube FPC panel is 1239.50 mm by 255.00 mm and marked “/39” ups. The strip FPC panel is 366.00 mm by 250.00 mm and marked “/1” ups. Neither entry explicitly states the finished circuit length, the cutting pattern, or the dimensions of a specific luminaire replacement.

Before selecting a panel format, map the required finished circuit outline to the fixture drawing. Identify which dimensions describe the finished FPC, which describe the production panel, and how the panel is divided into units. This prevents a common procurement mismatch: treating a panel’s long dimension as the installed length of a single tube or strip circuit. If a project needs an exact length or non-standard outline, the required dimensions should be provided for supplier review; they should not be inferred from the panel figure.

The Roll to Roll Infinity FPCB listing offers a further PI, single-sided format, with 0.15 mm overall thickness and a panel size of 1000.00 mm by 124.00 mm (/13) ups. It can be considered as a format reference when discussing longer or panelized FPC production, but the specification does not establish that it is an exact substitute for either listed tube or strip FPC. The application drawing and production requirements still need to match.

Where high thermal conductivity fits—and where it does not

Thermal conductivity is a material property; overall FPC thickness is a separate construction dimension. The WODE product data supplied for the tube and strip FPCs identifies PI, layer configuration, copper foil information, thickness, panel dimensions, solder mask, silkscreen, and surface finish. It does not give a thermal-conductivity value for either FPC. A buyer therefore cannot use the listed thickness or the PI designation as evidence that either product meets a particular high-thermal-conductivity target.

The available third-party evidence includes a supplier-attributed 1–3 W/m·K range for aluminum-core PCBs. That range refers to aluminum-core PCB information, not to the WODE PI tube or strip FPC specifications. Other supplier-reported thermal figures in the evidence package use differing product definitions and do not have a harmonized test method. They should not be averaged, ranked, or treated as a universal benchmark.

This boundary is important when a fixture brief combines flexibility with a thermal requirement. The FPC may address the circuit’s shape and packaging, while the full assembly’s thermal path depends on the design and its materials. Available evidence also describes aluminum-backed PCB designs as a means of improving heat removal, subject to specified temperature tolerances. That is supplier technical guidance for aluminum-backed designs; it is not evidence that a particular FPC or complete luminaire will achieve a specified temperature or output.

For a High Thermal Conductivity LED PCB requirement, specify what must be demonstrated: the material or layer to which the conductivity value applies, the test method, the relevant board construction, and the thermal acceptance criteria for the assembled fixture. If a flexible circuit remains necessary, evaluate its mechanical fit separately and request applicable thermal validation for the complete design. A substrate label alone is not a substitute for this evidence.

A project-fit workflow for tube and strip retrofits

1. Record the fixture envelope. Use the project drawing to define the available space and the intended finished circuit outline. Do not substitute a manufacturing panel dimension for the installed-part length.
2. Compare the listed constructions. The tube FPC is single sided, PI, and 0.08 mm overall. The strip FPC is PI, offered single or double sided, and 0.115 mm overall. Use these facts as comparison inputs, not as a complete fit decision.
3. Confirm the panel-to-part relationship. Ask the supplier to confirm the production panel arrangement, number of units, finished dimensions, and any required cutting or routing details for the project.
4. Separate mechanical and thermal acceptance. Check thickness and outline against the fixture. Separately define the thermal requirement and request evidence that applies to the selected construction and assembled application.
5. Resolve unspecified details before release. The supplied product data does not state a finished-part tolerance, bend radius, thermal conductivity, or thermal test result for the tube and strip FPCs. Confirm any such requirements in the project specification and supplier documentation.

Application fit and practical limits

The tube and strip FPCs are both listed for lighting applications. Their names make them relevant starting points for tube-light and strip-light project reviews, but the available specifications do not claim suitability for every fixture or retrofit. Fit depends on the actual design. Buyers should avoid extending these product entries into unsupported claims about street lights, flood lights, downlights, spotlights, grow lights, or other specific fixture categories unless the relevant product drawing and evidence confirm that use.

The same caution applies to the phrase “High Thermal Conductivity LED PCB.” The available evidence associates aluminum and metal-core PCB products with high-power LED and thermal-management applications, but it does not establish a WODE thermal-conductivity specification for the PI FPCs listed here. Nor does it provide comparable thermal-resistance or reliability test results for the tube and strip FPC options. Where thermal performance is a project gate, those missing points should remain explicit procurement questions.

WODE’s product data is useful at the early evaluation stage because it identifies concrete construction and panel-format options. Its limit is equally relevant: a product listing is not a finished retrofit qualification. The buyer still needs an application-specific drawing, confirmation of the finished circuit dimensions, and thermal evidence tied to the chosen assembly. This approach keeps the selection anchored to verifiable facts while preventing flexibility, thinness, or a material name from being mistaken for demonstrated thermal performance.

What the specifications mean for procurement

For procurement teams, the central decision is not simply whether to buy an LED PCB or an LED FPC. It is whether the documented construction can be mapped to the fixture and whether the supplier can confirm the requirements that the listing leaves open. A useful RFQ should distinguish the finished circuit from its production panel, state the required overall thickness and layer configuration, and identify the thermal criteria that the assembled product must satisfy.

For engineers, the listed values can support an initial mechanical comparison: 0.08 mm for the single-sided LED tube FPC, 0.115 mm for the single/double-sided LED strip FPC, and the respective panel sizes shown above. They do not replace detailed design review or testing. For sourcing teams, the key is to obtain a drawing and written confirmation that connect those listed values to the actual project revision.

For buyers evaluating a High Thermal Conductivity LED PCB, the most defensible approach is to keep two evidence tracks visible: dimensional fit for the tube or strip fixture, and thermal qualification for the complete design. WODE’s listed FPC formats inform the first track. The supplied data does not close the second. Treating the two as separate acceptance questions makes the specification clearer and reduces the risk of choosing a circuit on the basis of an unsupported thermal assumption.