Philips SON T (Comfort, PIA Plus, PIA Hg Free) lamps are high pressure sodium (silver-colored alkali metal) lamps with bright elongated (tubular) form. The exterior is a hard glass outer envelope. All have the E27 or E40 lamp base. The SON T lamps give a little warm yellow / orange color. Application of the SON T lamp. One she sees in many public lighting such as tunnel lighting and security lighting, railway, railroad crossings, airports, harbors and docks, quarries, lampposts, etc.
Differences in the SON SON T and T PIA lamps.
- PIA versions such as the SON T PIA Plus and SON T PIA Hg Free have a Philips Integrated Antenna) (PIA) for the highest reliability over the life of the SON lamp. The integrated antenna is:
- Brought about a more stable discharge
- Better lumen
- A stable power - shorter start-up time,
- Higher efficiency and better lumen maintenance and longer lamp life.
Operation of the SON T lamp The fundamental principle behind the lamp is that the narrow, monochromatic sodium resonance lines can be considerably increased if is increased, the vapor pressure of sodium. The key to the success of the high-pressure sodium lamp is an arc tube made of translucent ceramics, since there is no glass which is known by the state of sodium corrosion at high temperature. The high pressure sodium lamp is the invention of General Electric USA, although Osram-GEC, Mazda and Philips were also key players in the race to create the first to SON lamp.
