Lighting condition
Indoor lighting, outdoor light, shading ratio, and product position directly affect energy harvesting. Luggage tags, wallet cards, and asset labels have different usage conditions.
Product / Light-Energy Tracker Card
Use ambient light to reduce tracker maintenance.
The light-energy tracker card integrates flexible photovoltaic harvesting, supercapacitor storage, low-power BLE, buzzer, and cold-pressed structure into a thin card body.
The light-energy tracker card uses indoor and outdoor light to reduce charging or battery replacement. Performance depends on light intensity, exposed area, supercapacitor capacity, standby current, buzzer use, and firmware. The product can support Apple Find My, Google Find Hub, or Samsung SmartThings Find hardware programs.
0.2mmflexible PV design
Supercapacitorenergy storage
Cold pressingthin formed body
Low maintenancelong-cycle use
Product Structure
The key is harvesting and low-power coordination.
Flexible PV provides the energy input. Supercapacitor storage, power management, low-power states, and advertising strategy determine whether that energy is useful. Cold pressing integrates PV, PCBA, storage, and surface layers into a stable body.
Energy storage
Supercapacitor capacity, leakage current, temperature range, and protection circuit must match standby current, not just a single component spec.
Surface window
PV window area, transparent material, abrasion resistance, and brand finish affect each other and should be designed with surface process.
Use Cases
Best for low-maintenance trackers, luggage tags, and asset labels.
Light-energy tracker cards suit projects that can support a more premium energy structure and industrial design. If the product often stays in darkness, battery capacity and low-power strategy remain essential.
| Recommended scenarios | Luggage label, premium tracker card, enterprise asset label, gift card, low-maintenance card device |
|---|---|
| Operating conditions | Maintenance frequency, harvesting efficiency, and battery-life performance must be tied to lighting environment, usage frequency, and test conditions. |
| Test focus | Lighting profile, storage capacity, standby current, buzzer frequency, surface wear resistance, and waterproofing requirements |
| Related content | Standard Tracker Card · FindMy Low-Power Design · RFQ |
Light-energy tracker projects need clear usage conditions.
Share the form factor, target size, PV window area, typical lighting, buzzer requirements, target ecosystem, and expected volume for the energy-harvesting and cold-pressed structure design.
Three Lighting Scenes
Indoor, window-side, and outdoor conditions require separate records.
Illuminance describes light as perceived by the eye and does not directly equal photovoltaic electrical power. Record illuminance, spectrum or source, PV voltage and current, angle, shading, temperature, and effective duration for each scene.
Indoor lighting
Record typical office, retail, or home positions. Lamp spectrum, distance, operating hours, and product orientation strongly affect harvesting.
- lux
- measure
- μA / V
- measure
Window-side
Separate direct and diffuse light, glazing transmission, orientation, and season. Window-side exposure is not constant sunlight; record effective hours.
- lux
- measure
- μA / V
- measure
Outdoor light
Record clear, cloudy, shaded, temperature-rise, and mounting-angle conditions. Strong light can raise input while increasing thermal and material-aging risks.
- lux
- measure
- μA / V
- measure
Energy-Budget Model
Energy is balanced only when harvesting covers the load.
Daily harvesting depends on measured PV current, effective exposure hours, and usable power-path ratio. Daily consumption comes from system average current over 24 hours. Their difference is the daily net balance.
Daily net = harvest current × exposure × usable ratio − system consumptionDefault inputs demonstrate the formula only and are not measured Yuli product results.
Test Record
What should be recorded in a light-energy test?
To determine whether ambient light can offset daily product consumption, record the sample under test, the lighting conditions, the energy harvested by the PV layer, and the energy used by the complete device. Test indoor, window-side, and outdoor conditions separately, while keeping the sample ID, PV lot, and firmware revision traceable.
Reading the result: A positive daily balance means harvesting exceeded consumption. A negative balance means the battery or supercapacitor must supply the difference.
| Scene | Lighting conditions | PV output | Exposure per day | Device average current | Daily result |
|---|---|---|---|---|---|
| Indoor | Lamp, lux, angle | V / μA | h/day | μA | Harvest − use |
| Window-side | Orientation, weather, shading | V / μA | h/day | μA | Harvest − use |
| Outdoor | Weather, angle, temperature | V / μA | h/day | μA | Harvest − use |
Decision Boundary
A PV layer does not mean self-powering in every environment.
A wallet tracker may stay dark, luggage-tag orientation changes, and an asset-label mounting surface may shade the window. The design still needs low-power operation, storage margin, and a dark-time assumption validated in the target structure.
Measure input
Measure voltage, current, and temperature with target PV and final optical surface under real sources and angles.
Measure load
Convert FindMy advertising, connections, buzzer use, and sleep into daily system consumption.
Measure reserve
Use available supercapacitor or storage capacity to calculate continuous dark operation.
Three-Scene Measurement
Build a comparable energy record with the same light-energy tracker card.
Enter illuminance, PV voltage and current, effective exposure, and average system current for indoor, window-side, and outdoor conditions. Daily harvest, use, and net balance are calculated locally.