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**Is light "pure" energy?**

I've been working out how much energy 60KG of material is equivalent to. However it strikes me as a possibility that I should not be using E=MC^2 because what I actually want to calculate is 60KG equivalent in light.

Is there a factor I need to incorporate? I am trying to establish the consequences of being able to convert 60KG into light with 100% efficiency in terms of kilotonnes of TNT.

Thanks very much!