Visitors view light installations in Chiswick House and Gardens during the Lightopia Festival official switching-on ceremony (photocall) in London, Britain, on Jan. 21, 2020. Lightopia will open to the public from Jan. 22 to March 1. (Xinhua/Han Yan)

A woman poses with light installations in Chiswick House and Gardens during the Lightopia Festival official switching-on ceremony (photocall) in London, Britain, on Jan. 21, 2020. Lightopia will open to the public from Jan. 22 to March 1. (Xinhua/Han Yan)

Visitors view light installations in Chiswick House and Gardens during the Lightopia Festival official switching-on ceremony (photocall) in London, Britain, on Jan. 21, 2020. Lightopia will open to the public from Jan. 22 to March 1. (Xinhua/Han Yan)

Visitors view light installations in Chiswick House and Gardens during the Lightopia Festival official switching-on ceremony (photocall) in London, Britain, on Jan. 21, 2020. Lightopia will open to the public from Jan. 22 to March 1. (Xinhua/Han Yan)

Visitors view light installations in Chiswick House and Gardens during the Lightopia Festival official switching-on ceremony (photocall) in London, Britain, on Jan. 21, 2020. Lightopia will open to the public from Jan. 22 to March 1. (Xinhua/Han Yan)

Light installations are seen in Chiswick House and Gardens during the Lightopia Festival official switching-on ceremony (photocall) in London, Britain, on Jan. 21, 2020. Lightopia will open to the public from Jan. 22 to March 1. (Xinhua/Han Yan)