Editorial owner: MCL Solar Knowledge Center. Verification rule: Model-specific performance requires the relevant test report, site data, calculation, and contract documents. Last updated: July 16, 2026.
Key takeaways:
- High-power is not a single standard and should not be defined by advertised watts.
- The design must close the lighting, daily energy, worst-month charging, thermal, structural, and maintenance checks.
- Use measured luminaire data and project simulation instead of unsupported efficacy thresholds.
- Large panels and luminaires increase wind area and foundation demand.
Define the lighting requirement
Start from the road or area lighting target. Record geometry, traffic or activity, maintenance factor, average illuminance or luminance, uniformity, and glare or TI where applicable. Select the model and optic from an IES or LDT file and verify the layout in DIALux.
Close the energy balance
Calculate load from the actual LED input and dimming schedule. Add all auxiliary loads. Size the battery using usable DoD, discharge efficiency, temperature derating, and required autonomy. Size the PV array from worst-month PSH and explicit losses, then check recovery after an autonomy event separately.
Thermal and electrical design
Review LED board temperature, driver and controller derating, battery enclosure temperature, wiring voltage drop, surge protection, and disconnect protection for the exact operating environment.
Wind, pole, and foundation design
State design wind speed in m/s, gust basis, applicable structural standard, projected areas of the luminaire and panel, drag assumptions, pole geometry, material, corrosion system, anchor bolts, soil parameters, and foundation calculation. A typhoon category alone is not a structural calculation.
Evidence package
- Model-specific photometric report and IES or LDT file
- DIALux calculation for the proposed geometry
- PV and battery energy-balance worksheet
- Controller and battery test data
- Structural calculation scope and installation drawing
- Ingress, corrosion, and surge reports applicable to the proposed components
Limitations
Do not use a universal claim such as 230 lm/W being required for highways. The acceptance basis is the model-specific report and the project lighting result.
Highway and high-power procurement checks
High-power selection should begin with the road-lighting calculation, not a wattage target. Confirm the model-specific photometric file, mounting geometry, uniformity and glare criteria, measured electrical input, thermal limits, nightly energy balance, panel area, wind loading and foundation scope.
For a split system, document cable size, voltage drop, connector protection, battery enclosure location and maintenance access. For an integrated system, document the available panel area, battery temperature exposure and service method. Any efficacy value must be tied to the exact LM-79 report and operating condition.