One could understand limited light in the case of very rare and fragile paintings and fabrics; this seems less needful for curios carved from jade and similar artifacts.
為了不傷害脆弱的稀有畫作而採用亮度低的燈光，這尚不難理解，但雕刻精巧的玉石或其他作品顯然並不需要這種形式的保護。