U.S. Philips Corporation

Franciscus G Sools

Alexander Victor Henzen

Ronald J Campbell

Johannes H Van Der Sande

Reinder Smid

A road marking unit (1) according to the invention comprises a house (10) with a light transmissive window (20). In the house (10) is arranged an electro-optic switch (30). In an activated state of the road marking unit (1) the electro-optic switch (30) achieves that light is reflected from the window (20) back to the window (20). In a de-activated state of the road marking unit (1) the electro-optic switch (30) achieves that light from the window (20) is absorbed. The road marking unit (1) of the invention has the advantage that it can also in bright environmental light it can be switched between visible and invisible.

Road marking unit and road marking system capable of switching from

The invention relates to a high-pressure discharge lamp for use in the vertical position, having a tubular ceramic discharge vessel, the electrodes being connected to current lead-through members which have been provided one at each end of the discharge vessel, a first, upper current lead-through member consisting of material which is resistant to attack by halogens and/or halides, for example molybdenum, and a second, lower current lead-through member comprising a hydrogen-permeable material, for example niobium.

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Eindhoven, Netherlands

Franciscus G Sools