High Pressure Sodium Lamps

DESCRIPTION	LAMP	PRICE
LU35/MEDED17	HPS, 35W, Medium Base, ED17 Clear - 12 per Case	7.52
LU50/MEDED17	HPS, 50W, Medium Base, ED17 Clear - 12 per Case	7.52
LU70/MEDED17	HPS, 70W, Medium Base ,ED23.5 Clear- 12 per Case	7.52
LU100/MEDED17	HPS, 100W, Medium Base, ED17 Clear - 12 per Case	7.52
LU150/MEDED17	HPS, 150W, Medium Base ,ED23.5 Clear - 12 per Case	7.52
LU70/MOGED23.5	HPS, 70W, Mogul Base, ED17 Clear- 12 per Case	8.21
LU100/MOGED23.5	HPS, 100W, Mogul Base ,ED23.5 Clear- 12 per Case	8.21
LU150/MOGED23.5	HPS, 150W, Mogul Base, ED17 Clear- 12 per Case	8.21
LU200/MOGET18TI	HPS, 200W, Mogul Base, ED18 Clear, 4K- 12 per Case	6.88
LU250/MOGED18	HPS, 250W, Mogul Base, ED18 Clear - 12 per Case	9.59
LU400/MOGED18	HPS, 400W, Mogul Base, ED18 Clear - 12 per Case	9.59
LU1000/MOGED25	HPS, 1000W, Mogul Base, ED25 Clear - 3 per Case	39.63

HPS Lamps

When compared with Low Pressure Sodium, 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; due to this broadening and the emissions from mercury, colors of objects under these lamps 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" (a name used primarily in Europe and the UK).

High pressure sodium lamps are quite efficient—about 100 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.