The invention relates to a high pressure mercury lamp which is operated with an internal pressure at least equal to one hundred and some dozen atm and in which the thermal load and gas convection are considered. A fused silica glass discharge vessel is filled with mercury in an amount at least equal...http://www.google.com.au/patents/US6274983?utm_source=gb-gplus-sharePatent US6274983 - High pressure mercury lamp with particular electrode structure and emission device for a high-pressure mercury lamp
