I have seen 860W AllStart CMH retrofits for 1000W QMH lamps, but that is the biggest I have seen. Well I did see a 1000W CMH lamp, but it had 2 arc tubes in series so it doesn't count lol.

Anyway, is there an actual 1000W CMH lamp? Or maybe something even higher? I did some searches here but didn't come up with anything significant. And if not, why? Does CMH only offer significantly greater efficiencies at smaller wattages?