Such as shame. Its heat/light burn. Its happened to me before with only 10 days left on the grow. I did leave alone but the sunburnt colas will do nothing more now. So I would look at, how long I've got left with grow and what is underneath the sunburned bits. If the sunburned bits were taken away allowing the 'new' plant canopy more light, an still enough time for this to happen then do it. If not enough time then leave alone until harvest. A steady oscillating fan, blowing between top of the plants and light, keeps the plant tops moving about. I run my fan even after my lights are out for a short time. There may be no light but the heat is still present.