Very skeptical given the price ... there enough, but we say that after all considering the price, you can change the bulb every 15 days they will pay no more expensive! For weeks and I still have my first 2 bulbs that take, and are even a bit brighter than original! 4 My mirror bulbs, and sincerely, with box of 10, that sounds out to 2 years easy, so go again!
Another very important point, packing, royal, cardboard in all directions, and on each bulb, ca no risk of breaking and avoids placing our fingers and lubricate the bulb accidentally by placing ... What the smacked faster because they overheat ...