When selecting nightlights, you must prioritize Light Source Technology, typically LED, for its energy efficiency and long lifespan (up to 50,000 hours). For nurseries, look for Adjustable Brightness (Dimming) and Warm Color Temperatures (2700K-3000K) to avoid disrupting sleep cycles. For hallway safety, prioritize models with PIR Motion Sensors (detection range of 3-5 meters) and Light Sensors (Dusk-to-Dawn) to automate operation. If sourcing for portable use, ensure the Battery Capacity is at least 1200mAh for 10+ hours of continuous high-brightness use, rechargeable via USB-C.