Hi
@IGAutoGrower! Your environment conditions and your feedings seem fine. My guess is that your HID light is out of order. Over the time, usually 6-12 months, HID bulb's efficiency decrease, because of the huge voltage pulse it gets each time the lamp turns on. The age of your ballast can also explain why the light's PAR efficiency has dropped. Finally, the temperature in your grow room has a role to play, indeed, HID bulbs are built to work in a defined temperature range, basically they need heat to reach their optimal spectrum and brightness, and a cold air coming onto the bulb can cause a noticeable reduction in it's efficiency. How old is your HID bulb, how many hours have you been playing with? Same question for your ballast? Do you have a fresh air intake coming onto the light? Hope this will help, keep us up-to-date and happy growing 👊