M. de Groot Armagh Observatory, Armagh, BT61 9DG, Northern Ireland
A. M. van Genderen Leiden Observatory, Postbus 9513, 2300RA Leiden, The Netherlands
C. Sterken University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium
Here we investigate the photometric histories of the luminous blue
variables (LBVs) h, AG, and HR Car within our Galaxy, S Dor, R127, R110, and
R71 in the LMC, and R40 in the SMC by collecting all available photometry.