Why do people use a Metal Halide for vegetative growth and High Pressure Sodium for flowering?
GreenCoast Hydroponics – FAQThere are a couple of reasons growers switch between bulbs during different stages of plant growth. First, Sodium bulbs can make some plants grow “leggy” and stretched out due to the high yellow to red spectrum they give off. Halide bulbs tend to keep plants “tighter”, with less space between internodes.
