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for up to about x40 mag "cold light" can be a energy saving lightbulb in a anglepoise lamp,

personally i used a pair of those LED Goose neck lights they sell for laptops
like this:
http://www.micros...light.html they give me enough light for photography (if you look at my post on Drosophilidae you will see a pic i took with such a set up)

one thing i will say is that, i wouldnt recomend a "digiscope" with a fixed digital camera you dont have expansion/upgrade room, as you would with a triocular