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    Watts amps and volts

    Watts stay the same and amps change. So if your ballast is rated 1000 watts at 120 volts that is 8.3 Amps (probably this is the 8 amps you saw). Your bulb is 300volts and thus will be somewhat under 3.3 Amps (assuming the ballast takes up some power).
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    Air pressure/temperature relationship

    When you compress air it heats, and when you decompress it it cools, but how much? Working from's_law I find the equation pressure/temperature=constant so I derived for example if the air is 10°C (283.16°K) and the pressure is 14PSI so... 14/283.16 =...