Can you link to some research on that? I'd love to throw together a hack where you use LED light strips to do this.
Isn't it possible that the light would increase bacteria though?
https://biology.stackexchange.com/questions/66878/blue-light...
Not sure how it would increase bacteria, as bacteria don't photosynthesis light, unless the lights gave off sufficient heat to increase their activity. If anything I would think the light might inhibit bacterial growth.
Turn one LED on, while the other stays off.
Observe the leaves of lettuce after a week.