Actually, the lower temperature for anodization is most likely going to create a thicker anodized coating. Remember, there are 2 process occuring during anodization...the electro-chemical creation of the anodized surface, and the dissolving of the surface by the acid. As long as the surface is created faster than the dissolution, the surface grows.
There are two possible outcomes...or a combination of both...both of which are good.
The lower temperature doesn't affect the creation of the surface, but what it does interfer with is the dissolution of the surface by the acid. The colder the electrolyte, the slower the acid dissolves the surface. All things being equal, the anodized surface should be thicker than if the piece was anodized at a higher temperature or at the very least you may find that the anodization progresses faster since the surface builds quicker without the associated level dissolution.
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