I bought a voice acrylic stand the day before yesterday, and since I hadn't lit it up since checking that it worked, I tried lighting up all of them in their member colors! The voice volume was surprisingly loud!
By the way, I also tried to see if other acrylic stands would work, but it didn't seem to work... (The acrylic stands I tried were Kana-chan in her Revenge outfit (B) and Kana-chan from the 47 Prefectures series)

I tried making the voice acrylic stand light up! | かなぽん's post