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Ceramic reflector for HID lamp Disclosure Number: IPCOM000022073D
Publication Date: 2004-Feb-23
Document File: 1 page(s) / 73K

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Ceramic reflector for HID lamp

A new type reflector has been developed. The reflector is made of a ceramic material. Suitable ceramic

is for instance alumina, which is heat resistant and has a high reflection coefficient over a wide wavelength range. Due to the good heat resistance of the ceramic reflector it is possible to construct the reflector of a more compact shape as would be possible with the commonly known metal reflectors. Consequently, when used for instance in greenhouses the more compact shape will also result in a better use of available daylight.

A further advantage of the ceramic reflector is its property of diffuse reflection, which allows in abandoning of complex reflector geometries.

In an advantageous embodiment the reflector is built up from a ceramic body of earthenware provided with a top layer of sintered high purity alumina. Preferably the alumina top layer is covered by a glaze. The glaze improves the possibility to maintain a clean reflector.

A further improvement is the possibility to use higher wattage lamps in the ceramic reflector. Where in known metal reflectors lamps of at most 600W can safely be operated it is possible with the new ceramic reflector to operate lamps of 1000W. For intense area lighting like in greenhouses this results in a significant reduction in number of reflectors needed to reach an equal level of light intensity.

A practical embodiment has been tested, in which the total reflection is measured as function of...