Are D2S bulbs interchangeable with D2R bulbs? I have a reflector type headlamp so I use the D2R bulb, the one with the metallic strip along one edge. I have read that the D2S bulb emits slightly more light. Has anyone tried this before? And since the D2R has the metallic strip to combat the glare how would a D2S which is used in projector-type assemblies work? Anyone who has any experience or more knowledge than me please let me know.