I echo Duncan's response. 2 x 300w halagon is going to give off a lot of light.
On the plus side there should be little alterations needed in Photoshop providing you take care with your set up. I'm guessing the fact that you mentioned CS2 is that your shooting digital and can set the light balance accordingly.
As Duncan has suggested, prior to undertaking any formal shoots, practice with family and friends, set the lights at different heights, angles and distances - consider reflecting one of a large bright surface such as a nearby wall?
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