A high pressure sodium (HPS) lamp is a type of HID light containing a sealed ceramic arc tube. The lamp is operated by igniting the gases contained within the arc tube—specifically: sodium, mercury, and xenon gases.
How are HPS Lamps Used in Cultivation?
HPS lamps emit light that is concentrated on the yellow, orange, and red end of the light spectrum. Red light stimulates flower, bud, and fruit production, so growers who use HID lamps typically switch from MH bulbs during vegetation to HPS bulbs for the flowering stage.
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