---> 8 snip 8
We regret very much that you give Bosch halogen lamps H7 Plus 90 cause for complaint, but you want to at first
inform you that we on these bulbs because of their good light yield and the bright light color, almost without exception
received nothing but positive feedback.
To the very good illumination values of H7 bulbs Plus 90 while taking into account the legal requirements
achieve the thermal properties of the lamps had to be stretched to the extreme. Although we very costly
Using production methods with costly components and filling gases, it is not physically prevent this
Have lamps over the life of standard lamps reduced life values
For the study of the life of technical products, the Weibull distribution has been established as a standard.
Shown is the failure rate in% over the entire lamp life time.
B3 value: Represents the premature failure rate of lamps 3% of all the tested lamps have failed in this burning time..
Tc: Represents the typical failure rate of 63.2% of the lamps.
B50 value: Returns the average life of the lamps again.
The statistical life values are for H7 Plus 90
B3 = 125h
Tc = 250h
A life of one year is therefore depending on the operating time of the light bulbs to be regarded as normal.
---> 8 snip 8
So about 250 hours for more than half of the lamps. They are at 2 hours driving per day with light none 6 month life. As for me: I'm back to the original equipment manufacturer (H7 OSRAM Longlife for 3.90 EUR / piece), are also initially installed in many cars. And probably not without reason. The last pair has held for almost 5 years in the car my wife.
I think their should BOSCH B3, Tc and B50 values (PS: No, a B50 value BOSCH did not specify in the mail) on the packaging write so that customers are aware that they spend twice for a bulb that usually shorter than the legal warranty keeps it prescribes.
