Design Methodology & Engineering Solution for OEM/ODM Partners
1. Executive Summary & Market Context
The commercial outdoor lighting market is largely split into two segments: high reliability AC grid powered fixtures, and standalone off-grid solar lamps. Standard solar fixtures rely on remote, top mounted PV panels wired to battery units and discrete LED arrays. While functional, this separation introduces aesthetic constraints, higher assembly labor, and exposure to weather related battery failures in extreme climates.
This paper explores an alternative structural approach: a coplanar integrated light engine combining a central monocrystalline solar cell with a perimeter Chip on Board (COB) LED ring on a shared substrate.
Rather than positioning solar as the sole power source, this design utilizes photovoltaic harvesting primarily as an auxiliary power supplement (to offset standby consumption or prolong battery runtime) and a natural ambient light sensor, allowing luminaire manufacturers to build compact, hybrid powered architectural luminaires.
2. Optoelectronic & Mechanical Architecture
2.1 Mechanical Layout & Optical Considerations
The module adopts a concentric coplanar geometry:
- Center (Zone B):High efficiency monocrystalline solar tile (~20–22% efficiency) protected by clear, low iron tempered glass or optical grade PMMA.
- Perimeter (Zone A):Circular COB strip utilizing phosphor encapsulation over dense LED dies to provide continuous, spot-free illumination.
| Optical Design Considerations Engineering Trade-off: Placing the PV collector in the center reduces the available light-emitting surface area (LES) and creates a physical center obstruction. To maintain proper beam uniformity, the outer optical lens/reflector must be calculated specifically to blend the ring-shaped source without creating central shadow artifacts in the beam pattern. |
2.2 Thermal Management & Heat Isolation
COB LEDs run hot, because it’s junction temperatures often reach 85°C. On the other hand, solar panels lose efficiency and degrade faster when overheated (losing roughly 0.35% power per 1°C rise).
Because aluminum conducts heat quickly, mounting both components on the same metal board creates a thermal conflict. To solve this, we use two simple engineering steps:
2.2.1 Direct Thermal Path under COB:
The heavy heat generated by the LED ring sinks straight through the copper base into the bottom heatsink, preventing heat from trapping inside the board.
2.2.2 Physical Isolation Slot (Air Gap):
We carve a physical groove into the aluminum substrate between the center solar panel and the outer LED ring. This air gap acts as a heat barrier:
- At Night: High heat from the lit LED ring cannot reach the central solar cell, protecting its glass/resin coating from heat aging.
- During the Day: High temperatures from the sunbaked solar panel stay in the center, keeping nearby driver chips cool and safe.
3. Electrical Architecture & Operating Topologies
The light engine can be wired into four primary application topologies:
- AC/DC Grid Priority with Daylight Sensing:
Main power is supplied via a standard LED driver. The PV panel voltage is read directly by the MCU logic to act as a precision lux/dusk sensor, replacing external photoresistors.
- Hybrid GridAssisted Mode:
PV energy harvested during the day charges a small onboard capacitor/lithium cell. At night, this auxiliary energy powers the standby control electronics (e.g., microcontrollers, wireless chips) to reduce grid draw to 0W during off hours.
- OffGrid Solar + Battery Mode:
Complete DC ecosystem paired with an integrated LiFePO4 battery pack. The MCU monitors real time solar yield and battery state of charge (SoC), automatically dimming the COB output (e.g., dynamic PWM duty cycle adjustment) to guarantee dusk to dawn operation even after overcast days.
- Smart Sensor / IoT Node Integration:
The extra substrate footprint accommodates low-power Bluetooth Mesh, Zigbee, or Matter SoC controllers along with PIR/PIR radar motion sensors.
4. Substrate Engineering & BOM Cost Analysis
4.1 Substrate Material Selection
- FR-4 Multilayer (Low Power):
Suitable for decorative accent lights under 3W total system draw where passive air convection is sufficient.
- Aluminum MCPCB (1.5mm – 2.0mm, >= 2.0 W/m·K):
Required for mid-to-high power commercial units (5W-15W) to handle COB thermal flux.
4.2 Bill of Materials (BOM) Breakdown (Estimate)
- COB LED Dies & Phosphor: ~35% of module cost.
- Custom Cut Monocrystalline PV Core: ~20% of module cost.
- Aluminum Base MCPCB & Etching: ~20% of module cost.
- Power Management ICs, Passive Components, Silicone Encapsulation: ~25% of module cost.
5. Technology Tradeoffs: Silicon vs. Perovskites
| Parameter | Monocrystalline Silicon (Current Production) | Flexible Perovskites (R&D Roadmap) |
| Lab/Commercial Efficiency | 20% – 23% (Stable) | 25%+ (Lab) / 12–15% (Commercial Module) |
| Outdoor Operational Lifespan | 20+ Years (<0.5% decay/year) | 3–5 Years (Susceptible to moisture/UV degradation) |
| Manufacturing Maturity | High yield, low cost supply chain | Pilot-line / Niche production |
| Form Factor Flexibility | Rigid planar tiles | Flexible, semi transparent curved layers |
Conclusion: Monocrystalline silicon remains the only viable commercial choice for immediate OEM production over a 5 years horizon. Perovskite integrated optics will be evaluated as encapsulation technology matures.
6. Regulatory Testing & Qualification Roadmap
To enable global distribution, the finished integrated module must pass standard industry verifications:
- Photometric & Electrical:
LM-80 test data for LED lumen maintenance (L70 > 50,000 hrs), ANSI C78.377 CCT binning.
- Environmental & Moisture Protection:
Conformal potting over conductive busbars to meet IP65/IP67 per IEC 60529.
- Thermal Shock:
1,000 cycles from -40°C to +85°C to ensure no micro-cracking in silicon solder joints or delamination of LED phosphors.
- Safety & Electromagnetic Compatibility:
UL 8750 / EN 61347 compliance for LED modules, FCC Part 15 Class B for onboard high frequency switching regulators.
7. Modular Engineering Customization Options
OEM/ODM clients can request variations across four standardized parameters:
| Module Zone | Configurable Options | Technical Objective |
| 1. PV Core | 30mm – 120mm Diameter Round, Square, Hexagonal Cut |
Power budget matching & architectural aesthetics |
| 2. COB Ring | 2700K – 6500K / CCT Tunable CRI 80+ / 90+ / 95+ (High R9) RGB / RGBW Multi channel |
Hospitality vs. Task lighting Color accuracy requirements Dynamic scene control |
| 3. PCB Substrate | Round, Arch, Contour Aluminum Single / Multi channel Trace |
Luminaire housing integration & driver topology compatibility |
| 4. Smart System | BLE Mesh / Zigbee / Matter SoC PIR Radar / Ambient Light Sensor |
App & Smart Home Ecosystems Automated Dimming Control |
8. Summary & Target Application
This concentric optoelectronic hybrid engine provides a practical, production ready solution for luminaire manufacturers looking to differentiate their outdoor and architectural product lines.
By combining optics, photovoltaics, and thermal management into a unified board level assembly, developers can reduce luminaire housing volume, streamline factory assembly, and deliver clean, modern fixtures for premium residential, hospitality, and landscape projects.
9. Q& A
Q1: Is this module a standalone retail product, or a component for our luminaires?
A: It is an integrated light engine platform designed specifically for luminaire manufacturers and lighting brands. You can seamlessly integrate this module into your own custom architectural, garden, or street light housings to create a unique hybrid product line.
Q2: What custom OEM/ODM options does your company offer for this module?
A: We offer flexible customization across four main areas:
Solar Core: Custom dimensions, shapes, or laser-etched brand logos.
COB Light Engine: Choice of CCT (2700K–6500K), high CRI (90+/95+), or dynamic RGB/RGBW color modes.
Board Profile: Custom aluminum PCB cutouts to fit your housing dimensions.
Smart Ecosystems: Pre-integrated Bluetooth Mesh, Zigbee, or Matter smart control modules.
Q3: How does partnering with your team help reduce our product development time and R&D costs?
A: Instead of designing thermal, optical, and circuit systems from scratch, you leverage our pre-validated light engine architecture. Our engineering team provides complete optical simulation, 3D PCB layouts, and rapid prototype fabrication, cutting your time-to-market by up to 50%.
Q4: What is the typical workflow and lead time from concept to sample delivery?
A: We follow a standardized 8-stage OEM development process:
- Requirements & Feasibility Review (1–2 days)
- Optical & Circuit Simulation (3–5 days)
- Rapid Prototyping & CNC Sampling (2–3 weeks)
- Lab Testing & Sample Delivery (1 week for validation)
Q5: How does your factory ensure product reliability and strict quality control?
A: Our production lines utilize automated High Speed SMT, COB wire bonding, and precision optical potting. Every production batch undergoes strict reliability testing, including IP65/IP67 ingress protection checks, thermal shock cycling (-40℃ to+85℃), and 100% aging burn in tests before shipping.
Q6: Can our fixture still use our standard AC/DC power supplies with this module?
A: Absolutely. The module is fully compatible with standard 12V/24V DC inputs and conventional AC LED drivers. You don’t need to completely overhaul your existing electrical supply chain to use our light engines.
Q7: In simple terms, what is the practical benefit of the solar panel if the lamp is plugged into grid power?
A: It serves two smart functions:
- It acts as an automatic daylight sensor to turn the light on/off at dusk/dawn without needing extra photoresistors.
- It harvests ambient light during the day to power background smart sensors and wireless chips, reducing your lamp’s standby power draw to 0 Watts.
Q8: Does your engineering team assist us with international product certifications?
A: Yes. All our modules are built to meet global compliance standards. We provide complete technical documentation, LM-80 test reports, and PCB design files to help your final fixture pass CE, RoHS, FCC, and UL 8750 certifications smoothly.
Q9: What are your Minimum Order Quantities (MOQ) for custom projects?
A: We support clients with flexible trial runs! We offer low MOQs for initial design verification and sample evaluation, allowing you to test market feedback before committing to high volume mass production.
Q10: How do we get started on a custom project with your team?
A: Simply reach out to our OEM support team with your target fixture design, power requirements, and housing dimensions. Our engineering team will prepare a preliminary feasibility assessment and 3D layout simulation within 48 hours.