An excellent choice for your double-ended High Pressure Sodium (HPS) system. Xtrasun lamps are engineered specifically for horticultural use, and offer exceptional performance. They consistently provide intense light in the correct spectral range for vigorous flowering growth and can even be used, if desired, throughout the full cycle (in both the vegetative and flowering phases). Your clear choice for HID lamps that provide long-lasting and reliable operation is Xtrasun.