Hey i noticed some wierd brown looking spots on so...

My latest grow (Vegan Widows) has exactly the same issue. It is the most stretched plant, so closest to the lights. But it is also occurring in parts of the plants that aren’t really close to the lights. My soil ph has been high though. Maybe as high as 8. I brought it back down to 6.5 and applied calmag to the feed. No spread of the issue now. It is difficult to say for sure what triggers these things because it can also be a combination. One thing I have learnt to do is always keep a close eye on ph levels. Get ph right first before fixing any nute issue. Having said that my plant still looks otherwise really healthy and is so close to harvest I doubt this issue will have much impact.

With cannabis plants that have light burn, your leaves can sometimes become yellow or red/purple, possibly with brown spotting, often with burnt tips/edges and margins that stay green. I would back grow light off a few inches. Don't want the buds to get burned.