Sunmaster Metal Halide lamps are primarily designed for vegetative growth. These lamps generate light from the blue parts of the spectrum, emitting the required band of light for plants in vegetative stages. These highly efficient bulbs can be used alongside sodium (Son-T) lamps in the flowering stage in order to achieve thicker stems and bushy plants with reduced stretch. Metal Halides can last up to nine months and are available in 250, 400, 600 and 1000 watt models.