Write an article mainly focus on bullet security camera introduction:

Part 1: introduce the pain points customer may encounter when picking security cameras, especially when he or she is knowledge-absent about security camera. Part 2: introduce what is bullet camera (appearance, main applicable scenarios, etc.) Part 3: introduce what pros or advantages does bullet camera has, especially compared to dome or turret cam. Please drop those pros with points. Part 4: Recommend three models of HIKVISION bullet cams: one mode that is cost-effective and quite affordable; one model that has IR illuminator and comparatively higher configurations, well reviewed by customers; one model that has Full Color Imaging at night and comparatively higher configurations, well reviewed by customers. Drop a conclusion for the whole article, telling customers it is crucial to match their own requirements with the parameters of cameras rather than their technical features or prices.