The present invention relates to certain imine-substituted heterocyclic compounds, and methods of treatment and pharmaceutical compositions that utilize or comprise one or more such compounds. According to the invention, the annular flange is fixed on the base by means of a snap or latching connection and is adapted to the lamp holder of motor vehicle headlights for halogen incandescent lamps. The wall is preferably made of a material with a high reflection coefficient such as aluminium and it is sunk depthwise into the thinned semiconductor layer, preferably in p+ diffusions formed in the layer if it is of p-type.