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I might be a bit late on this conversation but better late than never:
If you did want to work out the average brightness of an image in photoshop this is how I would do it:
1) perform a gaussian blurr (filter menu -> blur -> gaussian blur) with an extremely high value, if not maximum value.
2) show the "info" toolbox (window -> show info, if not already visible). this shows mouse cursor x, y and RGB colour values as well as a few other things.
3) select a tool such as the eye-dropper or Move Tool.
4) move your mouse over the image, the areas of average brightness (if there is still any variation after the gaussian blur) and watch the RGB values in the info toolbox. They should be quite consistent. That will be your average brightness.
As others have said, they should be in the range of 60-70. If not, you need to increase or decrease your exposure times appropriately.
Roger.
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