If your plants exhibit these physical signs of not getting enough light, it may be because your grow light is too far away or ...

There is an inverse relationship between distance and light intensity - as the distance increases, light intensity decreases. The relationship is not linear. The light energy at twice the distance ...

Inverse square law Irradiance of electromagnetic radiation ... Wave particle duality The photoelectric effect shows that light is made up of individual photons. Photoemissions will take place ...

And it does that rapidly. Light intensity decreases as a mathematical function called the inverse square law. You don't need to know the equation, but you do want to know how it works. As the ...