In a hydrogen atom, the L shell has an energy of -3.4 eV and the K shell has -13.6 eV.

In Bohr's model, electrons move only in fixed shells, K, L, M, N, each with a fixed energy. An electron in a shell does not lose energy. A jump to a higher shell takes in energy; a fall to a lower shell gives out the difference as light. In hydrogen, the levels are K $-13.6\ \text{eV}$, L $-3.4\ \text{eV}$, M $-1.51\ \text{eV}$ and N $-0.85\ \text{eV}$.