Fifty pounds isn't "light." History will bear out that 45# was the best selling bow in the 1960's from Bear, Pearson, Wing, etc. Anything over 55# needed to be special ordered from Bear.
Another thing; you are much better off with a lighter bow that you can draw to full length, and get a good dynamic release, than one you struggle with to get to draw. Performance is a fickle friend, and the numbers on the side of a bow don't tell you much. Once you understand how personal form affects performance, you will be enlightened about so-called light bows.