- Upgrade your grow lights with this high-quality, 400W HPS bulb! Perfect for hydroponics and outdoor gardening, this bulb will provide the perfect amount of light for your plants to thrive. Whether you're a seasoned gardener or just starting out, this bulb is a great choice for anyone looking to improve their yields.With its durable construction and long lifespan, this HPS bulb is sure to provide reliable performance for years to come. So if you're ready to take your gardening to the next level, order yours today and see the difference for yourself!