Key technical parameters to evaluate when choosing solar street lights:

• Lumen output – Indicates brightness level
  
• Color Temperature (CCT) – 4000K–6500K preferred for natural lighting
  
• Color Rendering Index (CRI) – CRI ≥ 70 for realistic color rendering
  
• Solar panel wattage – Affects charging speed
  
• Battery type & capacity – LiFePO₄ recommended; must match LED power
  
• Working time & backup – ≥12h/night; ≥3–5 days of rainy-day reserve
  
• Warranty – 3 years or more for reliability