A factory-side wholesale guide to close-proximity pyrotechnics (舞台烟火) built to fire metres from people — concerts, TV, weddings and indoor events. Explains the five effect families (gerbs & stage fountains, flame projectors, concussions & flash pots, cold spark machines 冷焰火 and confetti), then the smokeless and cold-flame stage consumables a Liuyang factory actually builds, how to read throw / duration / clearance specs, telling stage-grade from a repackaged consumer toy, and the T1 / T2 and NFPA 1126 proximate-audience rules.
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