Isn't it supposed to be the other way around? 13 hours light and 11 hours dark?
Not sure, I only remember reading somewhere about it- havnt actually tried it myself so you could be right.

Like ProGro said, harvest time depends on trich colour, they start off clear , then turn milky and then amber, if you dont want the burnt out feeling then chop them when they are mostly milky, not amber. Youl need a cheap 30x microscope for that, cost about $15 or so from Ebay.

This page shows shows exectly what I mean, excuse the weird url lol