Despite growing underground, largely in darkness, roots emerge to be very sensitive to light. Recently, several important papers have been published which reveal that plant roots not only express all known light receptors but also that their growth, physiology ...
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Some gardeners are against them as they stress the roots out too much, see this for the low-down.
remote control version here https://www.amazon.co.uk/GreenBrokers-Changing-Illuminated-Planter-Control/dp/B081DJ6DZC/ref=sr_1_4?dchild=1&keywords=LED+Planter&qid=1618313201&s=outdoors&sr=1-4
Illuminated planters already exist and you can buy them online. I like this one to be honest. There are some cheap rubbish ones on amazon too.
Making them is easy. Would love to kit my entire garden with this setup.
Got these for the windowsill, highly recommend them.