A better perspective is often about changing the point of observation with respect to height, distance or angle. A better light has to do with, well, getting a brighter light so we can see something more clearly. This metaphor works better to complete the idea of getting "a clearer perception" due to the greater visibility the charter allows. It might be the lack of context, but I don't much like the construction of this sentence as it is, and I think the idea could be more clearly expressed some other way.
"A better light" can also sometimes have the meaning of seeing something with more optimism or thinking better of something than one might have previously, which I don't think is being implied in this case.
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