the silver vision bulbs I believe are only single stage bulbs.
If you take a dual stage bulb which lights up when the headlights are on, then you can lightly coat it with silver paint so it is hidden in the housing when off, but still glows orange when on.
I believe this is similar tot he way phillips has theirs, simply orange with a light coat of silver ont hem to hide the orange when off.
I have my rears done this way, but my fronts are clear bulbs, which looks good with the headlights on.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.