The name "420" references the area of the light spectrum produced by this grow bulb. The PowerVEG 420 is a true VEG light for indoor growers. PowerVEG 420 provides a spectrum that is crucial for plant growth during the vegetation cycle, focusing all spectral energy at 420 nanometers. This high UV A spectrum adds the nutrient values that are vital for the growth. Combined with the spectrum provided by the FS+UV fluorescent grow lamps, the PowerVEG 420 maximizes the initial growth process for vegetation through, Tighter internodal spacing Stomatal opening 10 times greater than red light (feeding tube of plant) Stronger root growth, Chlorophyll A, Lutein, Zeaxanthin , Beta carotene
Spectrum Combinations for Your Plants The PowerVEG 420 can be combined with more than just Eye's FS+UV lamp. There are five total PowerVEG colors lamps that can be combined to make customizable light spectrums for your plants. Check out Eye Hortilux's main PowerVEG page for suggestions on color combinations.