IntroGro 400W HPS Lamp – Dual Spectrum Grow Light for Flowering & Vegetative Stages Maximise your indoor garden’s potential with the IntroGro 400W High Pressure Sodium (HPS) Lamp, a powerful, dual-spectrum grow light engineered for both vegetative growth and explosive flowering. Designed for compatibility with digital and electronic ballasts, this lamp delivers high-intensity output and optimal spectral performance at an unbeatable price point. Dual Spectrum Output: Supports both vegetative and flowering stages, eliminating the need to switch bulbs mid-cycle. 400W Power Rating: Provides robust light intensity for medium to large grow spaces. Optimised for Digital Ballasts: Ensures stable performance and extended lamp life. E40 Base Fitting: Universally compatible with standard grow light fixtures. Affordable & Reliable: Ideal for beginner and budget-conscious growers without compromising on quality.