Originally Posted by MSo
Hi, my Question is :
What is the difference between them? Possible to use D2R in Morettes
The difference is that D2R bulbs are intended for use in reflector housings and have a black mask printed on the glass to minimize glare. They are otherwise physically and electrically identical to D2S, so you can use them in projectors, however the light output will be reduced somewhat. You could scrape the mask off (gently so as not to break the glass) and effectively turn them into D2S bulbs.