L, N at left upper corner of intelligent lighting module is zero-crossing detection connection line, not for power supply. Some manufacturers put power supply on module, which is quite unprofessional. Disadvantage 1: Unsafe. Hot temperature will be caused if power supply is next to control module, and thus safety hazard is generated. All our relay control modules are designed with strong and weak current isolation. Disadvantage 2: Space-wasting: Power supply part will occupy at least 2P air conditioner. Disadvantage 3: Cost-wasting: One of our power supply modules can realize power supply to around 30 control modules.