I think I get it now. The terminology was confusing me; between socket and screw base.
Think he's just saying as long as the screw base of my bulb is E39 then I'm good to go up to 750W MH, which still isn't what is printed on the box, but I'm only running 600W. E30 must have been a typo.
The sticker makes some sense now, as 750W HPS bulbs are rare/inefficient, but they do exist. ;P
Inside the socket reads 1000W 400V.
As an aside I picked up the following:
E40 lamps typically fit E39 lamp holders, but E39 lamps will not fit E40 lamp holders correctly causing lamp problems.
That's every 10 minutes of my life.
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