There are a couple of dueling misconceptions about light roasted coffee concerning the caffeine content. In our experience, those coffee drinkers weened on the specialty coffee of the 1970's and the famous oily black beans of the era, tend to believe that Dark Roasted coffee packs more punch. Indeed it may from a perspective of pure intensity, but that doesn't mean it carries more caffeine. Then there are those who have come of age in the Third Wave of coffee and are happy to report that in fact Light Roasted coffee has more caffeine since dark roasting burns out all the
go-juice. The truth is, however, that the caffeine content in one coffee "bean" is the same no matter if it is Light or Dark roasted. The difference in caffeine content comes from the volume of coffee used when brewing. Light Roasted beans are SMALLER than their Dark Roasted counterparts because their cellular fibers haven't been blown apart and expanded. So if you measure your coffee using a scoop, then yes, you're getting more caffeine when you used a Light Roast because more beans can fit in that scoop. However, if you weigh your coffee (like most coffee pros) the caffeine content should be the same. (Courtsey of redrooster coffee)