Why does Scrooge like the darkness in Stave One of A Christmas Carol?

Scrooge's
office is dark because he constantly tries to save money in being stingy with candles and coal.
But Dickens is also using a classical binary opposition (light/dark) to symbolize good/evil.
Binary oppositions have been a staple in most movements of literature: Male/female,
Public/private, Light/dark, Majority/minority. (With the emergence of Modernism and particularly
Postmodernism, these oppositions began to be questioned and deconstructed as a result of the
inequality of privileging one term over another - such as Male/female.) 

So
the binary opposition is something theorists have used to note symbolism but also for purposes
of criticism. In this case, the use of light and dark to symbolize good and evil is a classic,
traditional technique; not some unfair privileging of light....