Hi, glad its of some use!
The EVG is actually floating and isn't touching any of the metal of the case at all. If I had screwn it to the case I would have had to insulate the bottom of it some how to be on the safe side. Instead its cable tied to the bundles of wires so it can move around slightly but not enough to touch any of the case.
Interesting idea you have for swapping the halide gear tray out for an external ballast. Its something I have thought about but have so far been unable to find a suitable dimmable ballast that the GHL could control. Do you have one in mind already?? Just in case you don't know the gear tray is the brown thing in the centre section at the oposite end to where the wires enter the unit. You'll find the power for it passes through one of the side sections underneath the T5 reflector in order that the wires don't have to pass near the halide bulb itself.
One thing that does spring to mind is how do you intend on changing the lamp holders for the halide as 150 and 250w bulb use different sized holders? You would also likely need to change the reflector also. Geisemann may be able to supply 250w parts? I wouldn't have this issue as my halide is already the 250w model.
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