I've always thought we should have a files upload area, where people can upload documents like this or PDF files of catalogue pages etc. It's certainly been discussed, but it would probably need a lot of tinkering behind the scenes to get it up and running. With Patrick being the  only one who can do the necessary coding, and the fact that he already has an ever-growing "to do" list, it may happen, but I have no idea when..!

Do you or anyone happen to have a similar list for USA Fluorescent lamps?  There are a few more exotic versions that I am not so sure about, in particular the T10 and energy saving types.

I think t10 lamps are designed to be interchangeable with t12 lamps and energy saver lamps have a lower voltage.


NHT50SDX   45V  1.32A 

 https://www.ebay.com/itm/373833147317?   Could someone save the pictures from that listing?

US HPS lamps are not compatible at all with EU ballasts for any wattage, even if they are nominally the same arc voltage.  USA generally uses constant wattage ballasts, which are relatively immune to lamp voltage changes. Because of this the manufacturing tolerances for lamp voltage of USA HPS lamps are quite huge compared to the EU types.  If used on the EU choke ballasts, which are highly sensitive to lamp voltage variations, those lamps will be proportionally over or under run.  They will run at different power with consequences for lumens, colour consistency and life.  EU HPS lamps can however be used on USA ballasts, because their voltage will always be much closer to the nominal value.

Even though that there are some series choke ballasts specifically designed for medium wattage North American high pressure sodium lamps, what is the precise explanation of North American 400W S51 high pressure sodium lamps being 100% incompatible with European 400W high pressure sodium ballasts and North American 250W S50 high pressure sodium lamps being incompatible with European 250W high pressure sodium ballasts? From what I see, I can hardly see any problems with interchanging North American 400W S51 high pressure sodium lamps with European 400W high pressure sodium lamps and North American 250W S50 high pressure sodium lamps with European 250W high pressure sodium lamps due to those lamps in particular having a similar arc voltage drop and operating current across lamp wattages. I was wondering if the 50Hz frequency of the European power grids has to do with North American high pressure sodium lamps being incompatible with European magnetic ballasts. In that case, should there be a significant reduction in service life of North American high pressure sodium lamps on 50Hz magnetic ballasts or any harm to European ballasts?

 Also cedrick u need point out the those EU SON  lamps works off our pulse start metal halde ballast 35 to 150 watt 100 volt lamps.   As those came out and designed to run EU pulse start lamps.  A ballast lot times is HX with power factor correction caps. on the HPS we also have small consumer grade fixtures where power factor not important in residental homes Tend have a choke with 3 wire ignitor 35 to 150 watt HPS running on 120 volt OCV 55 arc volt types.   


  For example for any one in the US may  have hard time finding a ballast for there S56 HPS 100 arc volt lamp.  This one can inerchange with 150 watt MH pulse start gear. 

This statement certainly does apply to lamps between 35-150W.

I was wondering if the 50Hz frequency of the European power grids has to do with North American high pressure sodium lamps being incompatible with European magnetic ballasts. In that case, should there be a significant reduction in service life of North American high pressure sodium lamps on 50Hz magnetic ballasts or any harm to European ballasts?

50/60Hz certainly does not matter. Arc lamps start to have troubles on 16.7 or 25Hz networks, but good luck finding one still in use outside some European railways like in Switzerland.

Though, interestingly, some part of US railways still use 25Hz too! https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system