I would expect any bulb to last more than a month and a half....I don't care what brand it is... But hella, cmon they arent liteglow here, they are the leaders in lighting technology. And as for the retrofit, I want both hi and lo beams, and properly focused lighting patterns and short of doing a Retro from another car, there is now way to get that. And I don't want the ridiculous glare caused by putting HID bulbs into a fcatory housing. Also I bought Hella for a reason, I would never use CHEAP hyper bulbs in my car. And for that matter I have done a couple retros and I do realise the light output they can give, I wanted to get the maximum output possible from an H4 setup.
And yes I do realise 100 80's are not legal, but then again neither is HID, or retrofitting any other cars headlight into my housing, and I am one of the few people who actually aim their headlights after installing bulbs, so I was sure to be very concious about oncoming glare, and proper beam placement on the road.
Anyways this was just a heads up for anyone that was looking to upgrade their bulbs that I do not recomend these ones. '