High Pressure Sodium ballasts

High Pressure Sodium Ballast

DESCRIPTION	BALLAST KIT	PRICE
HPS35-0084-KT	35W High Pressure Sodium Ballast Kit, R-NPF, 120V	30.30
HPS50-0086-KT	50W High Pressure Sodium Ballast Kit, R-NPF, 120V	30.30
HPS70-0088-KT	70W High Pressure Sodium Ballast Kit, 120V	34.49
BB-0070HPA6HC	70W High Pressure Sodium Ballast Kit, Quad Tap	29.60
HPS100-0090-KT	100W High Pressure Sodium Ballast Kit, 120V	34.49
BB-0100HPA6HC	100W High Pressure Sodium Ballast Kit, Quad Tap	31.52
HPS150-0092-KT	150W High Pressure Sodium Ballast Kit, 120V	35.93
BB-0150HPA6HC	150W High Pressure Sodium Ballast Kit, Quad Tap	37.60
BB-0250HPA6CC	250W High Pressure Sodium Ballast Kit, Quad Tap	52.80
HPS250-0162-KT	250W High Pressure Sodium Ballast Kit, CWA-HPF, 480V	85.49
HPS250-0005-KT	250W High Pressure Sodium Ballast Kit, CWA-HPF, 5-Tap	100.73
BB-0400HPA6CC	400W High Pressure Sodium Ballast Kit, Quad Tap	60.00
HPS-400A-P-HP	400W High Pressure Sodium Ballast Kit, 5-Tap	100.06
BB-1000HPA6CC	1000W High Pressure Sodium Ballast Kit, Quad Tap	111.20
S52/1000CWA/5T/K	1000W High Pressure Sodium Ballast Kit, CWA-HPF, 5-Tap	136.58

High pressure sodium (HPS) lamps are smaller and contain additional elements such as mercury, and produce a dark pink glow when first struck, and a pinkish orange light when warmed. Some bulbs also briefly produce a pure to bluish white light in between. This is probably from the mercury glowing before the sodium is completely warmed. The sodium D-line is the main source of light from the HPS lamp, and it is extremely pressure broadened by the high sodium pressures in the lamp; hence colors of objects under them can be distinguished. This leads them to be used in areas where good color rendering is important, or desired. Thus, its new model name SON is the variant for "Sun".

High pressure sodium lamps are quite efficient—about 100 lm/W, up to 150 lm/W, when measured for photopic lighting conditions. They have been widely used for outdoor lighting such as streetlights and security lighting. Understanding the change in human color vision sensitivity from photopic to mesopic and scotopic is essential for proper planning when designing lighting for roads.

Because of the extremely high chemical activity of the high pressure sodium arc, the arc tube is typically made of translucent aluminum oxide (alumina). This construction led General Electric to use the tradename "Lucalox" for their line of high-pressure sodium lamps.

Xenon at a low pressure is used as a "starter gas" in the HPS lamp. It has the lowest thermal conductivity and lowest ionization potential of all the non-radioactive noble gases. As a noble gas, it does not interfere with the chemical reactions occurring in the operating lamp. The low thermal conductivity minimizes thermal losses in the lamp while in the operating state, and the low ionization potential causes the breakdown voltage of the gas to be relatively low in the cold state, which allows the lamp to be easily started.

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