When evaluating LED portable products, prioritize Luminous Efficacy (lm/W) to ensure high brightness with low power consumption. Look for a Color Rendering Index (CRI) of Ra>80 for natural light quality. For battery-operated units, verify the Lithium-ion battery capacity (mAh) and ensure it includes Overcharge and Over-discharge Protection to extend the product's lifespan. Additionally, check the IP Rating (e.g., IP54 or IP65) if the product is intended for outdoor or industrial use to ensure dust and water resistance.