The Philips Master SON-T PIA Plus HPS bulb outperforms any HPS light bulb. It's a high pressure sodium bulb made of clear and top-quality material and delivers high output levels. The unit is cost-effective and it's designed based on the "Plus" concept. The "Plus" concept means increased light output and no maintenance requirements. The product's high lumen output is maintained throughout its lifespan. Its robust and strong build ensures top-quality light for huge harvest yields.