The Elite 600w HPS Dual Spectrum Bulb is a powerful and intense bulb with a very high lumen output, for the vegetative and flowering stages of a plants growth. It is durable and economic with no need to swap for a different bulb between plant growth stages. It has a lifespan of over 30,000 hours, meaning it can be used for multiple grows, and is made with technology that is more efficient than other grow lamps on the market. The Elite HPS Dual Spectrum bulbs offer high quality, intense light and is designed with an E40 fitting which can be used in most reflectors and fixtures