The Philips Master Green Power 400W 240v HPS lamp is a dual-spectrum lamp.
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. Lumens is a measurement of total light output, not the amount of light that plants can actually use.
The Philips Master Green Power 400w HPS has lower lumens output than some other HPS lamps but it actually produces more useable light for your plants than any other making it the best lamp for growing plants that you can get.
The Green Power 400W 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