It certainly won’t be as heavy as it’s original

I don't think I've even seen a proper CSI ballast tbh.

I look forward to seeing the completed article! it will also be interesting to see how well the lamp runs on this setup, I note the ballasts also have both 240V and 230V taps, which should give you some ability to fine tune things if you wanted to

Hopefully it should work as this setup is what Thorn themselves show in the 1975 catalogue lol.

yeah as you say its exactly what Thorn did themselves Im just always interested in seeing the details! especially what im curious about here is each ballast is rated to limit current to 4.6A given a ~105V lamp (a 400W HPS lamp) which is 13.8A total, but of course a 1000W CSI lamp runs at 75-85V so there will be more voltage dropped across the choke and their-for more current flow so it should work nicely! but im still curious to see where the values end up on so much so that I have finally just bought an Oscilloscope, suitable high voltage differential probe and Current probe, I am quite looking forward to seeing the fine details of things and being able to measure the output of HF gear as well, its something I have always wanted but im sure as you know its not cheap but finally after the recent 200W SLI/H tests I decided im going to finally get something!

Heh I've had my DSO for ages now, can probably get ones miles better these days. I did hack mine to get 100mhz bandwidth though lol. I must get a better current probe tbh as the one I have only has a bandwidth of something silly like 25khz.

Yeah I got the same one you have, its a few years old now as you say, but looking around I dont think it can be beat still, (although of course saying that now that I have ordered it, in true sods law fashion im sure Dave at EEVBlog will now show case a brand new must have budget scope LOL) but its also so popular that I wont be short of guides and what have you as I try and figure my way around it! and then ill probably hack it as you say LOL, indeed I got myself current probe with a Bandwidth of 800Khz because I want to specifically be able to look at the current and measure the current of HF gear

The last time I checked, current probes with decent bandwidth were in the order of over twice what I paid for the whole scope lol. Not really worth it for what I'm doing tbh.

I haven't watched EEVBLog for quite a while. I just started to find Dave really annoying tbh. Mikes Electrical Stuff more my speed.

Yeah! I much prefer Mikes videos as well! especially for his awesome teardown videos , thankfully the probe was not twice the cost of the scope! more about half the price of the scope, still not cheap mind! and indeed quite annoying too in that, theres a couple 20Khz jobbies for relatively cheap, but the next level up is like 800Khz and about twice the price, no one seems to make one in the middle so to speak! its annoying because a HF ballast is only 20-60Khz or something there about, so I only really need a 100Khz probe really! but again I was not able to find anything like that and what I did find was the same cost as the 800Khz probe so I "just" went for that in the end!

Yeah the "fuck it" factor always wins in the end lol. Mikes videos are awesome because he actually *does* stuff personally and professionally. Dave has all this kit and that massive well stocked lab but what does he do with it all? Nothing? The last videos I watched was mostly full of "I can't be bothered with doing this, that" or anything. I mean I watched one where he was wondering why they had done the this but it was obviously part of a debounce circuit for a keypad lol?

That'll be a heavy control box