Rules of the Air Article 24

A pilot may switch off or reduce the intensity of any flashing lights fitted if the operation is likely to:1. adversely affect the satisfactory performance of duties; or2. subject an outside observer to harmful dazzle.
中文原文 飛航規則第24條
駕駛員在下列情況時,得將閃光燈關閉或降低強度:
一、影響操作時。
二、對相關工作人員造成目眩時。

English translation for reference only; the Chinese text prevails. Not legal advice.