General technical Informationlamp design characteristics
temperature influence |
| The danger on permanent bulb temperatures over 100 degrees Celsius is that gases may diffuse out of the glass. The steam molecules dissociate, and the oxygen joins the tungsten to build tungsten oxide which will then being transported to the glass of the bulb. The tungsten will be left on the glass whilst the oxygen joins again the hydrogen, building water molcules, returning to the filament and starting a new cycle. |
This is called the "water cycle" and can be recognized by a dark glass bulb surface and a reduction in light intensity.
According to the supplied power and the surface of the glass bulb, the glass temperature of a miniature lamp is about 20-40 degrees Celsius above the ambient temperature which has to be kept down accordingly in order to prevent the water cycle mentioned before.
Oshino Lamps succeeded to develop a line of lamps for use in night vision equipment with NVIS displays in combination with IR filters. These lamps operate effectively at a temperature above 100 degrees Celsius.
If you have such an application, please do not hesitate to contact us for further details on this line of lamps. |
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