The concept of Bell Hammer Seven and Bell Hammer Light is to extend the life of the engine, reduce noise, and provide comfort. However, the content will be a completely different product.
The major difference in features is that Bell Hammer Seven is finished with a focus on mitigating mechanical noise from cranks, cams, and others.
The bell hammer light is finished with the aim of greatly improving the pickup (response).
Also, even if you mix it with Bell Hammer Seven and Bell Hammer Light, you can use it as if both features were mixed without any problem.