Is there any semantic difference between these sentences? Does the article makes any difference?
As fast as light can go
As fast as the light can go
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All light has the same speed; it is difficult to imagine a context in which it would make sense to single out some particular identifiable form of light (red? green? ultraviolet?) as a standard of comparison.
As fast as the light can go might be appropriate if you were using light as a mobile source of illumination: "Rob is running ahead with a light, and I'm having no trouble following him—I can bicycle as fast as the light can go."