SUNMASTER Dual Spectrum - Single Lamp System 400 WATT. One lamp for the complete growing cycle At different times in the growing cycle, plants require different types of light radiation. Immature plants have different needs to those about to mature. To maximise the potential of a plant, to ensure that it grows strong and healthy, you need to deliver just he right kind of light radiation it needs - when it needs it. The NEW Sunmaster Dual Spectrum lamp is a radically new, scientifically developed lamp designed for the commercial and hobby grower. Using the new Dual Spectrum lamps - which are fully compatible with your existing fittings and ballasts - you can deliver improved blue and red light to your plants at the crucial stages in their development. And it's so simple to do.