I think it's the bulb that's close then. Its 10-15 cm from the top that is damaged. I used to have it a bit further away. I raised the lamp just now.
Temps are high 70's, will be low 80's an day now, summer is aproaching fast! But that is not to hot for my girl. Ventilation is good, inline fan as exhaust plus pc-fan blowing on the bulb and ceating airflow. Come to think of it, the pc-fan might have blown hot air from the bulb on to the bud, causing the damage. Hmm, that would have been stupid.
Thank you all for advice! Take care
/k
edit: Haha, just measured again, to be on the safe side. Turns out my bulb used to be 5cm from the top. Now it is 17 cm from it. No wonder it got burned! She grows so slow that I don't notice her getting taller at all, have not raised my lamp for ages.