flash convertor?

i saw in a thread recently a statement about a flash convertor. i have never heard of this type before. exactly what is a flash convertor? is this a better type or not . i see most don't state if it is a flash type or not. how do you know if it is? is there some external difference? i saw by chance comp cams makes flash convertors. they only offered up that they are more efficent at highway speeds......ok transmission guys lets here some knowledge! :thumbup: