Most likely they had a remote
transformer and are beam projectors. ("concentric
spill rings in front.") The lamp from description is possibly a 1M-G40SB (as I
call it) #578K from Radium. It's a low
voltage sealed beam lamp in a G-40 size with a unique
base. Decent lamp, amazingly powerful. Not all that expensive or rare either. Note the below website is incorrect in lamp
base type. It's also the only source to that brand I can find. Need a better link.
I have the NS250/T where I work and have extensive experience with the lamps and fixtures. Basicially both the used ones we got way back when from BASH than later 4th
Phase simply had metal fatique on their
transformer mounts, than a later show wanted scrollers mounted on them and the fixtures converted into follow spots. This required me adding extension handles to them and counter balance by way of steel plates to the bottoms of the fixtures - plus more reinforcing. Interesting project from a few years ago.
Fairly common lamp if it's what I'm thinking for Euro beam projectors which is what I think you describe and you might just find your model in the photos. I know where I work has four NS250/T but they look more like 5K Fresnels than
cone shaped
PAR's.
1M-G40SB #578K Radium(Osram/Sylvania) G-40 Silver Bowl (Doctor Fisher) 1Kw/24v PK 30d Lamp
Base Lcl 4.1/4"/
MOL 7.1/2"
Possible they are versions from:
Reiche & Vogul Revolux/Bright Beam R&V Beamlights (Beam Light/
Fixture Mfgr.)
http://www.revolux.com/Englisch/NV_Parabol/NV_Parabol.html
Radium Die Lichtmarke (Lamp Mfr.)
http://www.radium.de/e/index.html
"They are cabled with 6/3 SO or #6
wire, terminating with either a camloks, 60a
stagepin, or a twistloc. The camloks are colored Red, Black and Green, indicating to me that they were part of a DC
power system." The 6/3 cable for me very likely could be because of a remote
transformer - low
voltage lamps at that wattage need huge cables to feed them. This especially if DC.
Could be that it's DC - a
filament lamp (at least most
filament lamps) don't care AC or DC though some lamps will be better for one or the other at times by way of design.
Filament notching on a low
voltage lamp most likely wouldn't be good and is often warned about so more likely it would be a AC
fixture. This lamp from the beam projectors I know very well, run on AC. At least I'm about 90% certain that the transformers in the fixtures I deal with are just transformers and not also rectifying transformers in making them DC. Have not updated my notes on this lamp recently - the lamp specs are in a bottomless stack I'm yet to get to. Above is what I do know about it so far.
I expect that your CamLoc's are mini-CamLoc's often called Tweko's such as the 15 series ECT from
Leviton?
Interesting assortment of
plug types, 90% of them especially the 60A
plug would be really bad to use with this
system given there is no transformers with the fixtures. Plugging into a 120v
outlet by mistake would make that lamp go
super nova really fast thus not using such plugs and idiot proofing the
system. Check the fixtures also to see if perhaps the transformers were removed. This to make them remote or if say the tranformer went bad, or perhaps was too heavy for the hanging position. Again, this
gauge of
wire would most likely be for a low
voltage lamp with a remote
transformer, but it's possible that these were later additions and there is room in the fixtures to re-mount the transformers thus only use a normal
power cord and
plug.
You are looking for fixtures that have factory parts verses something that often is a hack way of doing it which was after market making it fit in deciding if it should be remote
transformer or
fixture mounted
transformer. You are also looking for stray un-explained mounting holes and or brackets in the frame where something is missing.
With the Euro website, transformers for these fixtures are available. Believe 4th
Phase is the exclusive distributer of this brand of
fixture, though TMB might have connections also.
Get them up and running and they will be some really powerful beam projectors. Concert tours still use them, and they do punch
thru moving light output.