Germicidal low pressure mercury vapor discharge lamp with...

Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium

Reexamination Certificate

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C313S013000, C313S639000

Reexamination Certificate

active

07816849

ABSTRACT:
A germicidal lamp having amalgam for controlling mercury vapor pressure contained in a location facilitating efficient high output operation. A low pressure mercury vapor discharge lamp has an amalgam container containing an amalgam positioned behind an electrode out of the arc path or space. The amalgam position is retained during high wall loading of the lamp preventing the amalgam from moving out of position. A heating and cooling element is placed generally at the amalgam position controlling the temperature of the amalgam. Efficient operation with high current loads and resulting high wall loading and temperatures is possible. The temperature control of the amalgam may also be used to dim or modify the illumination output of the lamp. The germicidal lamp is particularly suited to being positioned vertically in a waste water treatment system.

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IESNA Light Sources Committee, Understanding and controlling the effects of temperature on fluorescent lamp systems, 1996, pp. 1-11.
J. Bloem et al, Some new mercury alloys for use in fluorescent lamps, Apr. 1977, Journal of Illuminating Engineering Society, pp. 141-147.

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