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| == Best retro purpose == | | == Best retro purpose == |
| High colour rendering sodium vapour lamps are a specialty product lamp highly suited for indoor lighting, due to the warm and pleasant light output. Although the lamp is not very efficient, the unique light output that leans strongly on warm tones creates a cosy atmosphere that highlights furniture and other items. The lamp and associated gear is not as suited for outdoor lighting as the cost of the lamp, service lifetime and efficiency is not as high as on standard high pressure sodium lamps.
| | Due to their yellow, monochromatic light, these lamps are rarely more than an option for lighting exterior areas. Although they are very efficient light sources, their light is unpleasant for just about any application. In starglazing, these lamps were appreciated due to the fact that their light is easy to filter out. As a security light, or as a light source on pedestrian or car traffic, they are fine. These lamps release low amounts of heat so they are better suited for enclosed fixtures. Their BY22d base is not as popular as others but large amount of lamps, fixtures and gears can still be found, used, on Great Britain, as this was a very large market. |
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| The lamp themselves do release some heat meaning that closed fixtures are not well suited if not specifically built for this purpose. A good high pressure sodium vapour fixture is flexible but a suitable lamp base is quite difficult to find as they were quite rare. Fortunately, a way of connecting the lamp can be easily improvised using a typical flourescent lamp starter base, even if the lamp itself may require some support to avoid improper contact. All sodium vapour lamps gear of similar power rating can be easily used. Note that typical sodium lamp ballasts have three connections using the semi-parallel ignition scheme rather than the parallel ones as on metal hallide lamps.
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| While products that have an internal ignitor are easier to operate, they are quite rare and are unavailable for higher wattage lamps. Also, they may be less reliable than standard lamps that do not include internal ignitors since the ones being supplied are built to a lower quality standard and made to a set cost and space constraint.
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| == Understanding manufacturer data == | | == Understanding manufacturer data == |