Happy new year to all!

Given the arc voltage tolerance and so the range of the corresponding actual arc current variation any arguing whether the "correct current" is 0.45 vs 0.5A is rather moot, it is just arguing what "nominal current" label should be placed for the whole range the things operate.

More important is the exact power tolerance, mainly including factors like mains voltage sensitivity of the magnetic ballast, plus the current crest factor.

And also do not forget the auto MH do not anticipate anything but square wave LFAC feed, the mains zero crossing reignition characteristics is just a completely unpredictable huge unknown, could be OK for one lamp and a complete disaster for other even when both are the same formal specs.

And obviously the mentioned ignition/startup problems.

It is also worth to mention that Schréder released also a LED conversion kit for the Furyo lantern range. One just has to replace the lamp socket with a LED module and the ballast with appropriate LED driver. According to my former workmate from Schréder there are some installations with them in France but he could not tell me if they were any good or not.

I would have a few but shipping from CH is extremely expensive I think. Picking them up would be the best solution.

Hello I’d be interested in the regent nighthawk

That’s…kinda stupid

Happy new year (again)! 

Well, generic 35(39)W MH lamp is specified assuming sinewave current at line frequency. It is a little known that MH lamps need some ~10% less current at the same power when running on squarewave electronic ballast due to power factor now essentially becoming 1 instead of ~0.9 when on line frequency sinewave.

Automotive lamp was for sure never meant to be run on the ballast choke, so may be Dor was not that much off the truth... )

Yes indeed I am aware of that. The current figure come from Osram datasheets, with 0.5A for an lamp exclusive for electronic ballast and the 0.53A for a lamp with choke. However I have looked at IEC 61167:2018 and there the following is specified:
With a choke: 0,53A
With an electronic Ballast: 0,46A.

So if we take ground on the IEC standard -what we should-, dor123 is correct and i apologise. However I find it strange that Osram lists other currents for their electroic only lamps.

Regarding interoperability:
D2 lamp on choke: Might work, however may have reduced lamp life as a choke has a higher current crest factor ans therfore more wear on the elctrode. Also the 15-25kV Ignition pulses may damage choke isolation.

Running a D2 lamp on 35W electronic ballast-does not work, no ignition, I have alredy tried that.

Running a 35W CMH on D2 gear, possible, maybe slightly underdriven, but that would need to be checked. However there may be problem when these lamps are tried to be hot restricken as they are not made to whithstand the ignition voltage.

When I am back home i would do some experiments with that. I have philips Prima vioson elctronic gear for CMH and two D2 lamp contrrolla, one BMW branded (Most likely made by Hella) and one chinese and see how they perform. 

What I am also not sure, how exactly the D2 lamp ballast drives the lamp. When the lamp is first inited the ballast "overloads" The lamp in order to get it warmed up quickly.

Update: I wanted to make a video of it working, and soon discovered that the said noise is only my hearing illusion: The piston pump like noise comes from the brushes and it have the usual turbine sound.

@stillaintjeff24
Thanks for offering! It seems to be very difficult to get people to do this kind of thing.

Anyway, if you have a low voltage transformer like a thermostat or doorbell transformer, you can use that (or if you happen to have a variac). Just use the same input voltage for both tests, preferably 24V or below. Using any cheap multimeter should work just fine since there won't be a lamp connected.

Test 1:
Connect the ballast as usual, but where there would normally be a lamp connected, just short the two wires. Measuring the current with a probed ammeter or a clamp meter, record the value when it is running.

Test 2:
Same setup as before, except this time the capacitor will also be bypassed. Record this current as well.

The difference between these two currents will hopefully be able to answer our questions. With MH ballasts, the capacitorless current is much much higher than the current with the capacitor connected, we shall see how this compares to HPS ballasts. Let me know if you need a drawing of how to set this up, you know how I love schematics lol.