The Philips Master Green Power 600W HPS lamp is a high performance, dual-spectrum lamp with a high 88,000 lumen’s output. It is a high quality light for the vegetative and blooming phases of growth with an extensive lifespan. The lamp produces light in the orange/red part of the spectrum for excellent flowering plus a generous amount of blue for healthy plants and vegetative growth. Lumen’s is a measurement of total light output, not the amount of light that plants can actually use. The Philips Master Green Power 600w HPS has lower lumen’s output than some other HPS lamps but it actually produces more usable light for your plants than any other making it the best lamp for growing plants that you can get. The Philips Master Green Power 600w lamp is built to professional standards and because of this it maintains it’s light output for much longer than other lamps, meaning it lasts longer between change-outs.