3 x Bulbs Enhance the growth of your plants with this set of high-quality parbright bulbs. Designed specifically for hydroponic systems, these 600W HPS bulbs are perfect for stimulating flowering. With a screw-fit design, they're easy to install and come pack of 3 providing ample coverage for your plants. Whether you're a seasoned grower or just starting out, these bulbs are an essential addition to your hydroponic setup. Suitable for a range of environments, indoor grow rooms..