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What about using that energy to emit light that plants can use at nighttime?

Many / most plants need some darkness to keep internal clocks properly functioning.

So maybe the effective day could be extended a bit, but likely not a whole lot; IDK if the increase in growth would be worth the LEDs.

This is exactly the kind of problem linear optimisation a.k.a operations research (O/R) is designed to assess.

Here's some cool info about extended sunlight crops.

Impressive!

Alaska outperforming warmer regions due to longer days is not something I had expected.

Plants in fields typically get way more light than they need, as it is, and benefit from shade.

Some pepper varieties show 3x yield, given afternoon shade.

I wonder about powering UV LEDs under crop plants to control weeds.

There was a study in germany on this.. 20 % are enough for 80 % yield..