Hi Grafikdon, I don't know if this is true for Carrara, but Ray Dream's volumetric lighting effects cannot be viewed through transparent objects (a program bug). In your rendering above, both of the light cones appear to originate from outside of the vehicle's headlights. If you moved the spotlights into the headlights, the light cones would fail to render even thought the headlight lenses are mostly transparent. I've not yet downloaded "Anything Glows" which was referred to in a recent thread, but I usually use two lights within a fixture. The first is a spotlight as you have used, and the second is a bulb light to illuminate the fixture itself (high brightness and low range settings). Regarding the drift of your lights, grouping them to the rest of your model should have kept them in place. You might try an object link set to "lock", but first I would check the animation timeline to make sure that you don't have any unwanted keyframes affecting the movement of your lights. Hope something in there helps Jim Z. a.k.a. Julian Boolean