Strain:
Indoor, outdoor:
Medium:
Nutrient type (synthetic minerals/organic/dry amendments/living soil/…):
Lights:
PPFD:
pH:
EC or PPM:
Temps (day and night):
Relative Humidity (day and night):
Water Temp. (if DWC):
Nutrient cycles (how often feed/water):
Tent, Room Size:
Ventilation:
Added Air (fans, portable acs, heaters, dehumidifiers) :
Co2:
Pot sizes:
Seed germination date:
Veg duration:
If you paste this into your first post and fill out to the best of your ability (what’s in bold is more crucial) all of us here can refer back to it for diagnostic purposes without having to request the crucial info again & again.
Make it a habit when you start a journal 
We would have to know your pH, EC, and feeding habits. Pretty sure it has nothing to do with your lights.