Nice formulas for the lambda invariant of an elliptic curve

Where can I find some nice formulas for the lambda invariant of an elliptic curve? I vaguely recall there's a nice product formula in terms of $q$, but a google search didn't give me much. Also, are there other formulas that express the lambda-function in terms of $q$ or give a precise formula for the coefficients of its $q$-expansion?

At the moment I have two books at my disposal: Silverman's advanced topics in the arithmetic of elliptic curves and Diamond&Shurman. Silverman gives nice formulas for the j-invariant, but I can't find much on the lambda-invariant, unfortunately.

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Have you seen this? –  Guess who it is. Oct 22 '11 at 12:39
I have never seen that! Thank you very much!! –  Bana Oct 22 '11 at 14:25
Make sure it matches the definition given in your books; I'm not sure what normalization they use there... –  Guess who it is. Oct 22 '11 at 14:26