| LED luminous efficacy |
Approximately 120–180 lm/W at the luminaire level |
Request test data for the complete lamp, not only the LED chip. |
Higher system efficacy can provide the required illumination with less solar-panel and battery capacity. |
| Rated power and light output |
Common roadway products: about 20–100 W and 2,400–15,000 lm |
Compare maintained lumens, optical distribution, pole height, and road width. |
Nominal wattage alone does not confirm road illumination or uniformity. |
| Color temperature |
Usually 3,000–5,000 K; 3,000–4,000 K is often more comfortable for residential areas |
Check the declared CCT and color consistency between production batches. |
Color temperature affects visual comfort, glare perception, and the appearance of the surroundings. |
| Solar panel type |
Monocrystalline silicon panels commonly offer approximately 18–23% module efficiency |
Verify rated power, dimensions, orientation, shading conditions, and charging calculations. |
Panel size and site solar resources determine whether the battery can be fully recharged. |
| Battery chemistry |
Lithium iron phosphate (LiFePO₄) is widely selected for outdoor solar lighting |
Confirm usable capacity, battery-management protection, and operating-temperature limits. |
Battery chemistry affects safety, usable energy, service life, and low-temperature performance. |
| Battery cycle life |
LiFePO₄ cells may reach approximately 2,000–5,000 cycles under specified test conditions |
Check the test depth of discharge, temperature, charge rate, and remaining capacity threshold. |
Cycle-life figures are meaningful only when the test conditions are clearly stated. |
| Autonomy after insufficient sunlight |
Typically 2–5 nights, depending on location, lighting profile, and required brightness |
Review the calculation using actual night hours, weather data, battery capacity, and reserve margin. |
A suitable reserve helps maintain lighting during cloudy or rainy periods. |
| Ingress protection |
IP65 minimum; IP66 is preferable for exposed outdoor installations |
Confirm whether the rating applies to the complete assembled enclosure and request test documentation. |
The first IP digit addresses dust protection, while the second addresses water protection. |
| Impact resistance |
IK08 or higher for many public outdoor applications |
Check the IK test level for the lamp housing, diffuser, and exposed components. |
Impact resistance helps reduce damage from vandalism, maintenance activity, and accidental impact. |
| Operating temperature |
Select a range covering the local climate; many outdoor units specify about −20°C to 60°C |
Confirm separate temperature limits for the LED driver, controller, and battery. |
Battery charging and electronic performance can change significantly in extreme temperatures. |
| Lighting control profile |
Dusk-to-dawn operation with programmable dimming, such as 100% → 50% → 30% |
Verify motion sensing, time schedules, dimming accuracy, and manual override options. |
Adaptive control can reduce energy consumption while preserving required lighting levels. |
| Mechanical and corrosion protection |
Aluminum housing with protected fasteners; coastal locations require enhanced corrosion protection |
Inspect coating quality, drainage design, fasteners, cable glands, and salt-spray test evidence where relevant. |
Corrosion can weaken mounting structures and compromise seals and electrical connections. |
| Photometric verification |
Use a complete lighting layout based on required illuminance and uniformity |
Request an LM-79-style electrical and photometric report or equivalent independent test data. |
Measured photometric data is more reliable than marketing claims based only on LED wattage. |
| Maintenance and replaceability |
Modular battery, controller, and LED components with accessible service points |
Confirm replacement procedures, spare-part availability, connector protection, and installation documentation. |
Repairable designs can reduce lifecycle cost and avoid replacing the complete lamp. |
| System compliance and documentation |
Applicable electrical, electromagnetic-compatibility, safety, and environmental requirements |
Ask for declarations, test reports, datasheets, installation manuals, and a traceable production specification. |
Complete documentation supports safe installation, regulatory review, and consistent product quality. |