I remember, i believe it was on overgrow. showing the "how to" to building a ballast. I did a search on google to find something and came up empty, could just be me maybe. but anyways if theres any electrical nuts let me know how to.
http://www.onlinepot.org/grow/wiringlights.htm thats basically the same FAQ from overgrow.com heres an archived version of the old overgrow growfaq... hope this helps! http://www.drugs-forum.com/growfaq/GrowFAQ Basic Topics.htm