Lensman is a cool anime but after watching you will be just as familiar with the novels as you are now. Outside of the character names, the anime takes nothing at all from the novels. As an action flick it's good, as an adaptation it is so bad that the estate of E. E. Smith has refused permission for any other adaptations of his work ever since. Think of the most poorly adapted thing you have ever seen in your entire life, and understand it is probably much closer to the source material than this is.