If you want to see what drugs cost to develop, just ask the scientists who develop them: http://pipeline.corante.com/archives/2012/08/09/getting_drug...
His numbers don't even pass the sniff test. If you want to find out how much it costs to develop a new drug, there is nothing stopping you from calling a CRO and asking how much they charge for phase III trials (they are all in competition, so they'll freely give you a quote).
The average cost for a phase III trial is approximately $15,000/pt/yr. 1000 patients is a pretty average size trial, so now you are at $15M for one trial and the FDA requires at least two phase III trials.
And that's just the cost of phase III trials which doesn't include: phase I, phase II, manufacturing, regulatory costs, etc. Donald Light's claim that drugs cost $45M to develop is laughable and the could only come from someone with no understanding of drug development.