Plants under LED grow lights need less water than under HID lights like HPS or MH. Cut watering to roughly half of your HID routine — if you'd normally water 6 times a day in a given system and medium, drop to 3 under LED. Less heat means less evaporation and slower uptake.
Over-watering under LED is one of the most common mistakes growers make when switching from HPS. Watch the medium, not the calendar: let it approach dry-back before the next feed, and your roots will thank you with faster, healthier growth.
30+ years growing hydroponically, 20+ years running his own hydroponics store, and 14 years designing and researching grow light spectrums. Regarded in the industry as a master grower, Dave brings deep knowledge of plant biology, nutrition and LED technology to every product.