HF lasing has been obtained from theP6(5) andP6(4) transitions as well as severalP5andP4transitions of HF. Lasing from these high vibrational levels was produced by transverse pulsed discharges in mixtures of HI, He, and SF6or SO2F2. The low bond energy of HI contributed to doubling the energy of laser pulses compared to the energy observed when H2was substituted for HI. The HF laser frequencies were also measured for other fuels with low RH bond energies.