"Ultra Vires" C#4

Leaf shape and size are determined by the level of the light captured within the leaf. Once the danger of heat radiation burning the leaves has been negated there is no such thing as too much light, there is a point of diminishing returns in terms of photosynthesis but so long as you keep temperatures under control "too much light" is not a thing. The plant uses its photoreceptors to keep accurate tabs on light levels around the plant, it uses this feedback that determines where it puts its resources moving forward. In low light low temperatures, the plant will produce big fat thick leaves, this is by design as there are few photons available it must make sure it captures as many photons as it can within the chlorophyll net inside the leaf epidermis hence It makes it as thick and dense as it can. Once the plant reaches high levels of light saturation and toasty temperatures you will noticeably see much smaller and thinner leaves form as the plant gets closer to high-level light sources. Useful to a knowing eye you can ballpark estimate if a light source is too far away just from looking. Plant life is hardwired to grow toward the light. With the introduction of LEDs, heat radiation is no longer a big issue. Left to its own intelligence a plant will slow down vertical growth once it can no longer grow vertically comfortably. By topping once and then some lst bend a (highest) main stem below any other plant will now devote all its resources to whichever stem/s are nearest the light source. Just keep bending them all over, and it will seem like the plants grind to a halt, distributing their little resources to so many main stems.