I think the dosing of Lugool's is usually cautioned for all except "experts", whatever experience level that entails, because of the possibility of overdose like Dawgface said. Iodine is more unstable than iodide. Iodide is supposed to be the safest form for dosing in an aquarium.
Here is a short article that doesn't get too technical on the subject. Iodidne comes in many products we already use in our reefs, so the question of whether it needs to be dosed separately can be difficult to answer.
http://blogs.thatpetplace.com/thatfishblog/2011/05/17/understanding-the-role-of-iodine-in-a-reef-aq/">http://blogs.thatpetplace.com/thatfishblog/2011/05/17/understanding-the-role-of-iodine-in-a-reef-aq/</a>
I use Lugol's as a Dip however, 40 drops per gallon for 10-14 minutes (I do 12). I have not found any negative issues r/t its use so far. It actually works great on LPS. I dip in Lugols and do a revive cleaning when placing LPS in my tank. A lot of times, if you see an issue in LPS, like loss of tissue, if you do a Lugol's dip it stops it. Jorge's son Matt at PureReef turned me onto it when I started adding LPS like Wellsos, Trachys, Elegance, and Euphyllias to my reef tanks.