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It has long been known that d-dimensional Euclidean point sets admit (1+ϵ)-stretch spanners with lightness W_E = ϵ^-O(d), that is total edge weight at most W_E times the weight of the minimum spaning tree of the set [DHN93]. Whether or not a similar result holds for metric spaces with low doubling dimension has remained an important open problem, and has resisted numerous attempts at resolution. In this paper, we resolve the question in the affirmative, and show that doubling spaces admitarXiv:1505.03681v1 fatcat:ehlgvtsgrvg6lem2m535klqtky