High Pressure Sodium (HPS) lamps are traditionally used to drive the flowering and fruiting stage of growth. They are rich in the orange / red part of the spectrum. This is the part of the light spectrum that has less energy per photon but plants are incredibly efficient at using it.
These Ultra Sun high intensity discharge lamps represent the cutting-edge of the indoor lighting industry. They feature a proprietary starter, ceramic insulation plates, stainless steel armatures, and green ceramic bases. All this adds up to greater reliability—especially when used with high frequency electronic ballasts.