To clarify an important point: this is including rest mass as part of the energy budget, as E=mc^2. In most discussions the conclusion is the opposite: you get

To clarify an important point: this is including rest mass as part of the energy budget, as E=mc^2. In most discussions the conclusion is the opposite: you get vastly higher moment/energy for massive particles, ordinary molecules like hydrogen, because engineers aren't counting the energy required to create hydrogen from nothing -- only the energy to accelerate it! The moment/energy of light is actually terribly low for practical purposes.