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Thank you both for the valuable information. The EL500 may well be the clue regarding the user who successfully used "Two Elinchrom 500WS lights with VML"
As for Innovatronics, I must be understood that this company makes one product line . . . inverter supplies, and therefore depends on attempting to achieve compatibility across many manufacturers and therefore does constant testing of all brands.
Paul C. Buff, on the other hand, like most other flash manufacturers, manufactures a wide range of lighting equipment, all designed to work together within the product line, without emphasis on trying to achieve compatibility with all other brands. Because of this, we do not attempt to define which other manufacturer's lights and models may or may not be partially or fully compatible. Perhaps using the Innovatronics link http://www.innovatronix.com/compatib.asp will be a general guide, even though there are several light models listed as not compatable with certain Innovatronics invererter (such as RX600) that are functional, at least up to two units per VML.
As for auto switching lights, I see no particular design challenge to preventing such units from operating from a 120VAC inverter, since the inverter output voltage never rises above 120VAC and there is no technical reason for such a unit to attempt to switch into 240VAC mode. So I suspect the issue is not actually the multi voltage capability, rather, that it is simply a shortcoming in the uP power supply to tolerate the necessary voltage drop during recycle of most inverters. However, a different situation exists when powering such units from a 240VAC inverter where the definite likelihood exists that the inverter voltage will fall below the light's switching threshold and cause confusion.
In designing Einstein, we considered all these factors to assure that a least three Einstein units can be operated from a single VML .. . either 120VAC or 230VAC versions.
Finally, there has been comments the the Innovatronics SE model will operate most auto voltage lights, but comments have been posted that this requires one 25 lb inverter per light . . . a pretty heavy load for the traveling shooter to carry.