Ejipci
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Hello, Ejipci, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:
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Welcome number 2
editI also want to welcome you, and apologize for reverting your edits. I hope that I won't discourage you, as your initial edits were very carefully done and included good sources, something that we need more of around here. I do think that the Efficacy page would benefit from a brief mention of the fact that there are two kinds of luminous efficacy, and I hope you'll still want to work on the radiation one, or "in optics" as I suggested on the talk page there. Ccrrccrr (talk) 12:45, 4 November 2009 (UTC)