Experience the growth-enhancing power of IntroGro’s 400W Metal Halide lamp, which bathes your plants in a blue light spectrum ideally suited for the vegetative growth phase. This encourages denser stems, a more robust plant structure, and vibrant green foliage. Emitting a pure light at 6000 Kelvin, it primes your plants for a flourishing pre-flowering phase. Compatible with any ballast, including HPS lamp ballasts, this versatile retrofit lamp promises up to 10,000 hours of performance. It’s the perfect choice for cultivators aiming to optimize their plants’ growth during the vital vegetative stage. There is no need to have two different ballasts, simply use this lamp during vegetative growth, and change to the IntroGro HPS lamp for flowering - all using the same HPS ballast. This allows the grower to give the plants the perfect Grow spectrum and Bloom spectrum for optimum plant growth, more compact plant structure and amazing high yields, while only needing one ballast.