Lyman alpha wing opacity data induced by collisions H-H and H-H2 for cool white dwarf atmospheres from Rohrmann, Althaus & Kepler, 2011, MNRAS, 411, 781. Calculations are based on the quasi-static theory and includes Doppler broadening. The broad-band colours located in the UV and blue spectral regions are shown to differ substantially from those published in previous studies, which did not include collision-induced Lyman α wing absorptions.