BioBudsanswered grow question 3 years ago Ok several things, next to the yellowish growth you also have some glossy darkgreen leaves. Also look at the leaftips, they are clawwing. The yellow topgrowth is caused by the new light make sure the light is 50/60 cm away from the canopy, the dark leafs are caused by too much nitrogen, in this fase ease on the N. Focus on P and K but, with these quantum boards especcialy when too close to the plants: givee xtra calmag! The clawwed pointy tips also point to overfeeding. Focus on potassium and phosphor.