Over the last two years there have been several experiments with high velocity ion beams directed towards the precision measurement of K X-ray transition energies in one- and two-electron ions. One of the purposes of these measurements has been to determine with some precision the 1s lamb shift in one-electron ions. To date measurements have been performed in the Z range from 17 up to 36. All of the experiments have used the same technique of measuring the total absolute energy of the 2p to 1s transition of the one-electron ion. Over this range of Z, the 2p 1 2 -1s 1 2 transition energy varies from ∼ 2958.5 eV to ∼ 13429 eV, and the predicted 1s Lamb shift varies from 0.9383(6) eV to 11.858(11) eV. The main parameter that has been varied in these experiments has been the means of excitation used to produce the one-electron ion. These methods so far have included beam-foil excitation of high velocity beams, gas phase excitation of an accel—decel beam, direct ionization of a gas target atom (recoil ion) by a highly charged high-velocity beam and excitation in a hot tokamak plasma. The results of these measurements will be discussed and compared with QED calculations. The limitations of the experiments and possible future improvements will be discussed. The potential of producing a beam of low energy, bare and one-electron high Z recoil ions with high velocity heavy-ion beams will also be discussed.