In regards to the energy saving mercury vapor lamps that have actually been made, I have not been able to find electrical specifications for the Westinghouse 300W energy saver mercury vapor lamps for North American 400W H33 mercury vapor ballasts as well as the Mitsubishi 375W energy saver mercury vapor lamps for Japanese 400W mercury vapor ballasts. However, I have been able to find electrical specifications for National/Panasonic’s energy saver mercury vapor lamps.
For your reference, here is what I have found out regarding National/Panasonic’s energy saver mercury vapor lamps for the Japanese market:
235W mercury vapor for replacing Japanese 250W mercury vapor:
140V 1.9A
Full power Japanese 250W mercury vapor is 130V 2.1A
280W mercury vapor for replacing Japanese 300W mercury vapor:
140V 2.2A
Full power Japanese 300W mercury vapor is 130V 2.5A
375W mercury vapor for replacing Japanese 400W mercury vapor:
145V 2.8A
Full power Japanese 400W mercury vapor is 130V 3.3A
660W mercury vapor for replacing Japanese 700W mercury vapor:
145V 5.0A
Full power Japanese 700W mercury vapor is 130V 5.9A
940W mercury vapor for replacing Japanese 1000W mercury vapor:
145V 7.0A
Full power Japanese 1000W mercury vapor is 130V 8.3A
I sourced the information from pages 1088-1095 of the 1992-1993 National Facilities and Outdoor Lighting catalog shown below:
https://esctlg.panasonic.biz/iportal/CatalogViewInterfaceStartUpAction.do?method=startUp&mode=PAGE&catalogCategoryId=&catalogId=792140000&pageGroupId=1&volumeID=PEWJ0001&keyword=&categoryID=&sortKey=&sortOrder=&designID=retireOut_sp&designConfirmFlg=An interesting thing to note about the energy saving National/Panasonic mercury vapor lamps is that they have virtually the same published initial lumen outputs as their full power counterparts while Westinghouse’s 300W energy saver mercury vapor lamps have substantially lower initial lumen outputs compared to their full power counterparts.
I have sourced information about Westinghouse’s 300W energy saver mercury vapor lamps for 400W mercury vapor ballasts on pages 47 and 49 of the 1975 Westinghouse catalog shown below:
https://www.scribd.com/document/112839524/Westinghouse-1975-Large-Lamp-CatalogMore information can also be found in the following post:
https://www.lighting-gallery.net/gallery/displayimage.php?album=lastup&cat=14606&pos=3&pid=265870