we are the manufacture of hid xenon kits(h1,h3,h4,h7,9004,9005,9006,9007,d2s,d2r...),and now we have produced the newset h4 flxible lamp which have been tested for 100000 times by turning on and then turning off continuously in 4 days,and so any interest pls kindly let me know,we will offer you the best quality and most favorable price. i am looking forward to your early reply.