Super light, life, unfortunately, far too short

I have 4 St. these lamps used as outdoor lighting. The luminosity is really very good. Unfortunately even 2 lamps are now failed after a burning time of no more than 1000 hours. The lamps are exclusively via a brightness sensor and is switched on and burn all night as this is given off no high exposure to frequent. Get right now a brand medication manufactured by Phillips or Osram test etc..

Update: There are now already failed all 4 lamps, the life is apparently all very similar because all the lights were taken geleichzeitig in operation, have always shone together and now have failed one after the other within a week all. So lifetime exceeding 1000 hours away from the specified 50,000 hours, for the price much too short.