I could only give it two stars. I am putting LED lighting in the school buses. I thought that being a Grote it would withstand the environment that it operates in better than some x-brand from elsewhere. But I put a set in a 2014 Thomas bus October 2017. One has already failed. it looks as though it has melted just above the bayonet part of the bulb above where it goes into the socket. With this happening already I am afraid that these bulbs will never work for long when I introduce it to 140-160 degree road heat. I hope the other ones work better.