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This is a relativelyThis is a relatively complicated process (that is, relative to planting in ground) but apparently quite do able. Gardeners in Alaska do it, as shown in pictures here (http://www.alaskamastergardeners.org/Dahlias.html); note that specific lighting details are not provided. Gardeners in Nove Scotia do it: More info on lighting is here https://sites.google.com/site/novascotiadahliasociety/growing-advice/starting-tubers And a gardener in Colorado does it and provides a lot of detail here: http://www.dahlias.net/seabox/lightem.htm Hope this helps!  

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