Thanks for the replies.
My total height is 70cm or 2.2ft which I know is really tiny, I'm creating a semi stealth scrog grow inside a chest of draws, which I got for £16 from Tesco's
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My reflector is 12cm/5" deep, so I have about 58cm/2ft to play with. Hence my original question about the pots height, I just wondered if i could use a wider shallower type pot ans i have 2sq ft of potential space for the length and width of the pot. I'm trying to roughly work out the gaps between my pot and the wire and the space between the wire and the lamp taking in to account growth and lumen per foot needed.
As a little experiment i have my bulb on in the background taking a temp from 6" uncooled..just for a little incite to temps generated., wow 94 deg f, hotter than i expected for a little hps.