wouldnt you NEED some light to get it balanced ?
this is how I do it
Here is how you teach the camera what the light is:
ââ"šÂ¬Ã‚¢ Have a piece of white paper handy. Put it in the light you wish to set for.
ââ"šÂ¬Ã‚¢ Press the Menu button to open Menu Page 1.
ââ"šÂ¬Ã‚¢ Select White Preset.
ââ"šÂ¬Ã‚¢ Press the shutter button to open the sensor window. A small square of image appears in the middle of the screen. You now see two choices, Cancel or Measure.
ââ"šÂ¬Ã‚¢ Point the camera at the white piece of paper. Sometimes you have to hold the paper up near the lens to make sure the camera sees only it. That?s okay; for this process, focus is irrelevant.
ââ"šÂ¬Ã‚¢ Choose Measure, and press the shutter button to confirm. The camera beeps and clicks, then returns to its normal operation: White balance has been achieved.
Images on the monitor screen may look different from the way they did before you performed the white balance, but there is no guarantee that they will look perfect
To gain confidence that the white balance is correct, shoot a test shot that includes the white paper. The image on the monitor screen should look quite good now. The paper should look white on-screen.
I dont put the white sheet SMACK dab in front of the lenses, it needs to see it, blocking light isnt a good idea.