Composite luminosity function of the H II regions detected by HIIPHOT on the selected galaxies. The Hα luminosities of individual H II regions have been corrected for dust attenuation and [N II] contamination as described in Sect. 3.2. The solid and dotted lines indicate the best-fit and 1σ confidence regions for the Schechter luminosity function parametrisation. The vertical dashed line shows the completeness of the survey. The small panel in the top right corner indicates the 1σ probability distribution of the fitted Schechter function parameters.