The Philips Master GreenPower 600W / 230 Volt HPS Lamp is a single-spectrum lamp with the most plant-useable light output of just about any 600 Watt 230 Volt lamp on the market. The lamp produces light mostly in the orange / red part of the spectrum for heavy flowering however it does produce some light in the blue part of the spectrum making it suitable for vegging. It has been specifically designed to make the most of your 230 Volt / 600 Watt system where it will produce more plant-useable light photons, of a better spectrum, than almost any other 600 Watt lamp available