Quote Originally Posted by PeterB View Post
... Then I also thought it wouldn't necessarily be at the right colour temperature because unless it was pointing straight up it would pass light reflecting from the surrounding terrain. ...

That will be close enough. You want some of the surrounding terrain. Just the sky alone would be too high of a color temperature. Avoid early morning and late afternoon. You can also get some daylight bulbs for you light table, but I would not go through that expense.