Mango Kush flowering early

From a fellow grower: I’m interested to know why the Mango Kush Photoperiod would show flowering under 18/6 lighting?

  • Strain: - mango kush
  • Type (fem/auto/reg): - fem
  • Climate (indoor/outdoor): - indoors
  • Medium (soil/hydro/details): - roots organic Lush
  • pH of runoff or solution in reservoir: 6.5
  • Nutrient mix strength (EC/TDS): 1/4 of recommended roots Organics
  • Light type & schedule: LED 600 watt 18/6
  • Temperatures day & night: 82/77
  • Humidity day & night: 40/45
  • Ventilation: 6” inline in 36x36 tent
  • AC: yes
  • Humidifier: No
  • De-humidifier: No
  • Co2: 1200 ppm

Ilgm mixed up your seed