Evening. I noticed that at my moose in regular distances always burn the light bulbs VORNE (H7). So about every 4 months.! Sometimes left and sometimes right. NEVER both at the same time. I then changed only one, and also sometimes both. And the pears did not touch with the fingers. Had last extra gloves on.!!!! And I changed the brand also. Finally I took Philips. Does anyone have an idea what it might be.??? Mfg. Stig.