I put two Sylvania Silverstars (glass housing included) in my 72 Blazer. The one headlight blew the second day I used them. Took them back to Pep Boys and got a replacement. I have not had any problems since. I don't drive it that often though. Maybe 15-20 times a year, maybe a 8 of them at night.
The light appears "white", but the light output appears the same. IMO you are just changing the shade of the light that is emitted from your headlights from slightly brown/yellow to white. When applying a coating of blue to a light bulb, this offsets the brown/yellow light to look white while also acting as a tint. Therefore, the light output is actually less when comparing like-for-like bulbs because some light is lost when passing through the blue tint.
If these bulbs were such a great idea and did increase light output, car manufacturers would be selling cars with them already installed.
So if you like your car to look a little cleaner or different because it has whiter color light being emitted from the headlights then these are for you. Don't expect to be able to see better though.
Before and After shots are great.
It should say: This is BEFORE with the just stock headlights on low beam. AFTER, we replaced the headlights and foglights with our bulbs. We turned them all on and held the flash-to-pass on too. We adjusted the shutter speed on the camera to stay open a little longer. Look, even the license plate lights appear a little brighter with our new headlights.
Basically most photos have been doctor'd or the details of what was before and what was after are left out.