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Difference between revisions of "Philips Master SDW-T"
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Higher colour rendering High Pressure Sodium Lamp with tubular bulb for outdoor lighting with 35W, 50W and 100W power rating | |||
== Features == | == Features == | ||
*Clear tubular outer bulb | *Clear tubular outer bulb | ||
*Internal high pressure sodium with ceramic discharge tube | *Internal high pressure sodium with ceramic discharge tube | ||
* | *PG12-1 base | ||
*Color rendering index Ra of | *Color rendering index Ra of 83 (on all lamps) | ||
*Typical lifetime of | *Typical lifetime of 15.000 hours | ||
*Luminous efficacy of | *Luminous efficacy of 26 to 50 lumens/watt (highest on highest wattage lamps) | ||
*Warm white colour designation ( | *Warm white colour designation (2500 K colour temperature) | ||
*Universal operating position | *Universal operating position | ||
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[[Image:Philips | [[Image:Philips SDW-T 50W.jpg|Philips Master SDW-T 50W]] | ||
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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. | |||
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. | |||
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. | 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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! Designation !! Base !! Lamp wattage !! Luminous flux !! Colour appearance !! Colour Temperature !! Colour Rendering Index <br/>(Ra8) !! Service Life <br/>(to 50% failures) | ! Designation !! Base !! Lamp wattage !! Luminous flux !! Colour appearance !! Colour Temperature !! Colour Rendering Index <br/>(Ra8) !! Service Life <br/>(to 50% failures) | ||
|- | |- | ||
| | | Master SDW-T 35W/220 E27 SLV || PG12-1 || 35 W || 1300 lm || Warm White || 2500 K || 83 || 15000 hours | ||
|- | |- | ||
| | | Master SDW-T 50W/220 E27 SLV || PG12-1 || 50 W || 2300 lm || Warm White || 2500 K || 83 || 15000 hours | ||
|- | |- | ||
| | | Master SDW-T 100W/220 E40 SLV || PG12-1 || 100 W || 5000 lm || Warm White || 2500 K || 83 || 15000 hours | ||
|- | |- | ||
|} | |} | ||
== Durability and Repair-ability == | == Durability and Repair-ability == | ||
Generally, sodium vapour lamps were very durable | Generally, sodium vapour lamps were very durable but these special lamps are less durable due to their higher discharge tube stress. As sodium permeates the discharge tube and electrodes are worn quicker, the lamp's output and colour rendering degrades faster than on standard high pressure sodium vapour lamps. | ||
Compared with modern LED lamps, sodium lamps compare favourably but they have a much poorer light output and require careful wiring. In most cases operational cost is lower as less powerful LED luminaries can be used since all useful light is directed downwards compared with the inefficient fixtures used on most sodium vapour lamps. Ballast and ignitors can survive tens of years if properly protected against direct rain or snow exposure. A complex circuitry means that lamp servicing is difficult and there are major risks due to improper wiring on servicing as large voltages may be present. | Compared with modern LED lamps, these sodium lamps compare favourably but they have a much poorer light output, efficiency and require careful wiring. In most cases operational cost is lower as less powerful LED luminaries can be used since all useful light is directed downwards compared with the inefficient fixtures used on most sodium vapour lamps. Ballast and ignitors can survive tens of years if properly protected against direct rain or snow exposure. A complex circuitry means that lamp servicing is difficult and there are major risks due to improper wiring on servicing as large voltages may be present. No lamp wattage seem to have been particularly popular as the whole range was used sparingly in commercial centers. Ignitors can be potentially repaired but the lack of schematics means that they can be repaired only by experienced persons and are, thus, mostly discarded when not working. | ||
== Greatest features & flaws == | == Greatest features & flaws == | ||
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! Features !! Flaws | ! Features !! Flaws | ||
|- | |- | ||
| High light output in very compact package || | | High light output in very compact package || Moderate risk of glare | ||
|- | |- | ||
| | | Pleasant warm light, highly suitable for indoor || Not very high efficiency and service life | ||
|- | |- | ||
| Mostly omni-directional light || | | Mostly omni-directional light || Hard to find lamp base | ||
|- | |- | ||
| Quick lamp start and restart || Requires bulky, heavy, complex lamp gear | | Quick lamp start and restart || Requires bulky, heavy, complex lamp gear | ||