5x Royal gorilla and 1x Jack herrer

Hello ! Hid 400w is good at 40cm (from the top of the plants) without cooltube and 20 cm with coultube so 30cm or 20cm could be good in your case. If you just want to make your plants stretch then put the light higher like you said 60cm could be good but they will only get taller without real beneficts as the space between the nodes will be hudge and you could loose light penetration to the lower buds. I hope it will help you 😁👍

I've seen a few of the seed companies defoliate at the start of the final two weeks. This to allow as much lights on the buds in the final bulking up phase. Personally I wouldn't defoliate anything servicing primo bud sites and stick to leaf tucking whenever possible. Those big healthy fan leaves, they are the ones that really fuel that meristem/node and its flowers. Concerning light distance ... I always thought you have to end at Wattage/10 cm for HID. So 60 cm tops - at the end of bloom - for a 600W HID.

Hey there @pixsna! You are experiencing interveinal chlorosis. There are two types of nutrients in a plant Mobile and immobile ones! Mobile ones are able to be moved around the plant and applied where needed while immobile nutrients cant be moved. The plant stores its nutrients in its leaves and when it lacks a certain mobile nutrient (like nitrogen) in the new growth it pulls that nutrient from the most effective area (most likely old growth). If the nutrient that is deficient is an "immobile" one it cant move the nutrient to the new growth so a deficiency will show itself directly where the problem is at. This is why paying attention to WHERE on the plant the deficiency is happening is important! If the yellowing(chlorosis) is occurring from the bottom up then its a nitrogen deficiency if the problem occurred from the top down you have an immobile nutrient deficiency that is causing your interveinal chlorosis. First thing I would look at is your PH make sure its not to high as this hurt most immobile nutrients. I hope this helps bring some insight. Please update us on the source of the chlorosis so we can better diagnose this plant. 😎 (If were looking at a N deficiency there isn't much you can do as the damage is essentially done)