Pistils drying too quick, why?

the coloration this early is a bit odd... any foliar applications? This can singe them at times. Any nanners or pollen sacs in the room? double check... you may or may not need 20/4 schedule. keep eye on that if it's only happening to pistils at top... if so 18/6 or 19/5 will probably be enough of an adjustment... you are pushing 40DLI give or take in hot spot of SF1000 on a 20/4 schedules... this may or may not be a bit too much... if only slightly too much the symptoms may take longer to present themselves too. stick to it and if no problems, then all is fine... but keep eye on it.

As a few have said..I wouldn't worry about it too much. If it was heat. Than you'd see it quicker in your leafs than the pistils.. Good luck

I'm with Ezzjaybruh here... I wouldn't worry at all!

Seems like your running a bit hot, two things to consider here, firstly add airflow, turn your fan on higher, add one or turn the light down a bit (you would be surprised on how little dli it needs at this stage) secondly never have the fan blowing directly ON the plant if you don't have an oscillator point it on high at the wall. Pointing it directly at the plant will cause the same thing that is happening now. Hope this helps.

Hola !!! No te preocupes, los primeros pistilos se van a ir secando y apereceran muchos mas blancos.amedida que avance tu floracion. Relajate suerte