Windows Phone brightness settings?

[Marquis de Faux]

On my 521, the lowest manual brightness setting is very bright, brighter than the automatic adjustment. It is unusable in the dark.
If I upgrade to the 635, which does not have an automatic brightness adjuster, will there be problems?

 

[stickyshocker]

On my 521, the lowest manual brightness setting is very bright, brighter than the automatic adjustment. It is unusable in the dark.
If I upgrade to the 635, which does not have an automatic brightness adjuster, will there be problems?

No that I have tried but I'm guessing it would be the same on each phone