I dont know, Google it. There are a bunch of speculations about it.
When I said reflect, it was probably an inaccurate statement. But there was something about the white version having light leaks. Isn't that one of the reasons why Apple halted the white iPhone because of the camera quality/light leaks from the white glass? But yea don't trust me to really give you the most accurate information about it, just look it up..
http://www.itechtrek.com/index.php/white-iphone-4-release-halted-for-camera-issues