Raise the light a bit, make sure your PH is spot on. And unless your flowering, switch to a Metal Halide light, High Pressure Sodium is not the correct spectrum for vegetative growth.

The yellow tips on the leaves are a first sign of nute burn.

As for the blotches where water actually got on the leaf, you nailed the cause. Also keep in mind that a water drop will magnify the intensity of the light and cause burns.



Good luck and happy growing! :weedpoke: