Extension rings for retrofitting the DOWNLIGHT COMFORT. : Aluminum rings available in different colors. Extension ring D140 for retrofitting the D100 luminaire version for ceiling cut-outs of 100-125 mm. Extension ring D190 for retrofitting the D150 luminaire version for ceiling cut-outs of 150-175 mm. Extension ring D240 for retrofitting the D200 luminaire version for ceiling cut-outs of 200-225 mm.