Black cap fitted with the graphene photon hair-care pad, red LEDs lit across the insert

Case Studies / Engineering assessment

Graphene Red-Blue Photon Hair-Care Pad

A custom-contoured wearable insert co-developed by XIHE and Lescolton: a flexible circuit carrying graphene far-infrared heating traces and 72 red-blue LED beads on one cross-shaped pad. Power, light and heat in a single thin layer — engineered once, fitted into many cap forms.

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01 / Product problem

A flexible wearable insert combining graphene heating film and a red-blue LED array on one circuit.

XIHE co-developed this wearable pad with Lescolton. The insert combines a graphene far-infrared heating film layer (5–15 μm band, material level) with 72 LED beads — 650±10 nm red and 470±10 nm blue, dual-color, three light modes (steady / breathing / flashing / off) — on a single flexible circuit cut to a cross-shaped contour. Power-on defaults to steady red light and the power-key indicator stays lit for 3s on boot; a long-press of the light key switches to blue. Heating is a short-press toggle that auto-stops after 15 minutes. A 1500 mAh battery with TYPE-C charging powers the pad; the pad cannot be used while charging — the indicator shows red while charging and goes off when full. The detachable insert fits multiple cap types, and LED count and spectrum can be customized per project.

Integration requirements

Define the target form (cap insert), the LED count and wavelengths (650±10 nm red, 470±10 nm blue), and the light/heat operating modes before the circuit is laid out.
Route heating traces and LED power on one flexible circuit — the contour, the current paths and the bead placement are drawn together.
Specify the control logic up front: default steady red on power-on, long-press light key for blue, short-press heating toggle with 15-minute auto-stop, charging lockout.
Keep the insert detachable and the electronics self-contained (battery, control module) so the pad fits multiple end-product forms.
State the graphene band (5–15 μm) as a material-level figure; keep product-level comfort and efficacy claims out of the engineering record.

Case record

Application & engineering tags

EngineeringFlexible Heating Embedded Heating

Project status

Development stage is not established by this assessment. Ask for the project-specific record during technical review.

Engineering assessment. Product imagery and proposed architecture do not establish tested performance or commercial development stage.

LED beads — 650±10 nm red + 470±10 nm blue, dual-color

3 modes

Light modes — steady / breathing / flashing / off; long-press light key for blue

5–15 μm

Graphene far-infrared band — material-level figure

1500 mAh

Battery capacity; TYPE-C charging; not usable while charging

Bare flexible circuit of the hair-care pad: copper traces, graphene heating strips and LED beads on a cross-shaped FPC — The engineering core: one flexible circuit carries the graphene heating traces and the 72-bead LED array on a custom cross-shaped contour.

Finished black hair-care pad held in hand, LED bead side facing up — Finished pad, LED side. The detachable insert fits multiple cap types.

Back of the hair-care pad showing the onboard 3-button control module — Onboard control module: three buttons for light, power and heat — no external controller needed.

Hair-care pad fitted inside a black baseball cap — Pad fitted inside a standard cap — one engineered layer, many end-product forms.

Red LEDs lit across the hair-care pad inside a black cap — Red mode active: 650 nm LEDs lit across the insert.

02 / Integration structure

Design the interfaces around the heater.

One circuit, two functions

The flexible circuit carries both the graphene heating traces and the 72-bead LED array. Power, light and heat share one thin layer instead of three stacked assemblies — a thinner insert, fewer interconnects, one integration point for the cap maker.

Contour first, components second

The cross-shaped contour was cut for the cap interior; the circuit pattern, bead placement and heating traces were then drawn to that contour. The form defines the circuit, not the other way round — which is why the same engineering approach ports to other wearable forms.

Custom Heating Integration, in practice

This is what XIHE means by Custom Heating Integration: one engineered heating-and-light layer, fitted into many end-product forms. The LED count and spectrum are customizable per project — the integration pattern is the product, not just the pad.

Assembly detail

Trace the electrical and thermal paths.

The pad as built: the heating-and-light layer, the control and power, and the detachable form that fits many caps.

Co-developed by XIHE and Lescolton. Flexible pad insert with 72 red-blue LED beads (650±10 nm / 470±10 nm), graphene far-infrared layer (5–15 μm, material level), 1500 mAh battery with TYPE-C charging.

Graphene heating layer

Far-infrared heating film (5–15 μm band, material level) across the pad area.

LED array

72 beads — 650±10 nm red and 470±10 nm blue, dual-color, three light modes.

Flexible circuit

Cross-shaped FPC carrying heating traces and LED power on one layer.

Control and power

Onboard 3-button module: light (short-press cycles steady/breathing/flashing/off, long-press for blue), power (default steady red, indicator 3s on boot), heat (short-press toggle, auto-stops after 15 min). 1500 mAh battery, TYPE-C charging; pad cannot be used while charging.

Thermal interpretation

Uniformity across the contact surface.

Spatial uniformity describes variation across an area. Control stability describes variation over time at one location.

Heat and light, one layer

The graphene film provides the far-infrared heating layer (5–15 μm, material-level figure); the LED array provides 650 nm red and 470 nm blue output. Both are driven from the same flexible circuit.

What the figures describe

72 beads, 650±10/470±10 nm wavelengths, 3 light modes, 15-minute heating auto-stop, 1500 mAh and TYPE-C are product-configuration figures. The 5–15 μm band is a material-level figure for the graphene heating film.

What the record does not show

No efficacy, wellness or hair-regrowth claims. This record describes the engineered insert only — not outcomes, not medical effects.

03 / Engineering validation

What could fail, and how to investigate it.

Proposed verification work. Test conditions and acceptance limits must be set for the specific assembly before testing begins.

Integration challenge	Possible physical mechanism	Proposed verification method	Engineering decision to evaluate
LED bead dropout on flexing	Repeated bending stresses solder joints on the flexible circuit.	Flex-cycle the insert and re-test every bead; check graphene trace continuity at the same time.	Circuit layout and bead placement.
Hot edge where traces converge	Current density rises where heating traces narrow near the contour edge.	Thermal-map the pad surface under full heat mode; verify spread against the acceptance rule.	Heating-trace geometry.
Configuration figure quoted as material figure	The 5–15 μm band gets repeated as a product-level claim.	Label the band as material-level in every figure table; keep product configuration figures separate.	Evidence scope and permitted wording.

Engineering record for the co-developed insert. Figures describe the pad configuration and the graphene film at material level; they do not establish wellness, efficacy or medical outcomes. Co-developed by XIHE and Lescolton.

04 / Development stage

Development stage is not established by this assessment.

Confirm the project-specific stage and evidence before treating an assessment as a qualified production program.

Engineering handoff records

Pad contour drawing and the FPC circuit layout (heating traces + LED array).
LED configuration: 72 beads, 650±10/470±10 nm, modes and long-press-blue logic.
Control and power spec: default steady red, 3s boot indicator, heating 15-min auto-stop, charging lockout, 1500 mAh, TYPE-C.
Scope note: no efficacy or medical claims; material-level band figure only.

Explore the validation framework →

05 / Next step

Move from this record to your product decision.

Review component scope, check the Engineering evidence, and bring your project requirements to a Technical Review.