how do you tell if its underfed when it looks spot using a torch and pale when the main lights are on?

[wilmagrower]

how do you tell if a plant is underfed when it looks spot on using only a torch and pale with the main lights on?

 

[anexgrower]

how do you tell if a plant is underfed when it looks spot on using only a torch and pale with the main lights on?

Post a pic

 

[hotrodharley]

Post a pic

With normal light.