When evaluating outdoor lighting, the Ingress Protection (IP) rating is paramount; look for at least IP65 to ensure protection against dust and low-pressure water jets. Additionally, prioritize fixtures made from die-cast aluminum with anti-corrosion powder coating or 316 stainless steel to prevent rusting in humid or coastal environments. For the light source, ensure the LED chips (such as Cree, Osram, or Lumileds) have a rated lifespan of >50,000 hours and a Color Rendering Index (CRI) of 80+ for high-quality illumination.