When selecting sensor lights, you must prioritize the Detection Range and Angle; for indoor use, a 120-degree angle is standard, while outdoor security lights may require 180 to 360 degrees. Pay close attention to the Luminous Efficacy (lm/W) to ensure energy efficiency, and verify the IP Rating (e.g., IP65 for outdoors) to guarantee water and dust resistance. Additionally, check the Sensor Type, choosing between PIR (Passive Infrared) for heat detection or Microwave sensors for high-sensitivity motion detection through thin walls.