light that grows plants in the night

 This light installation is very pretty, isn't it? Be aware that its author is a utopian artist and a company called Biolumic who are developing the light delivery technology.

Of course, supplementary lighting has been a commonplace of glasshouse growing for many years. Here is Agriculture Canada in a delightfully utopian period piece uploaded years ago.

What is (not particularly) new here is the idea that you can boost productivity, increase pest resistance, boost growth etc. through "light recipes". LEDs, as anyone who has ever tried to match four bulbs after one has died knows all too well, come in all of the colours. White from warm to cold, and everything else as well. These purplish colours seem popular. I remember them at The IKEA Future garden at Chelsea 2019:

You can buy IKEA grow lights, as well as many cheaper solutions of course. Many are purplish. 

I don't have anything beyond a bright tube light in my verandah (the main indoor plant space). Maybe I should get them some supplementary lighting? Bet the tomatoes would appreciate it.