Starting is relatively simple with small tubes but can require significant voltage with larger lights. Commonalities Between LPS & HPS Lights:īoth low and high pressure sodium lights require ignition which is typically provided by a voltage pulse or a third electrode (an additional metal part) internal to the bulb.

The spectrum of visible emissions from an LPS light is actually very close together (589 and 589.6 nm, virtually monochromatic) resulting in the colors of illuminated objects being nearly indistinguishable. Once the metal is vaporized the emissions become the characteristic bright yellow associated with sodium vapor lamps. During start (while the sodium is still in solid form) the lamp emits a dim reddish/pink glow. The bulb principally contains solid sodium metal inside a borosilicate glass tube that vaporizes once the lamp is turned on. Low pressure sodium vapor (LPS) lights are a specif ic type of gas-discharge light (also known as a high intensity discharge, HID or arc light). Low Pressure Sodium What is a Low Pressure Sodium Light? Search The Site Menu Home / Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium

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