My R6 has an R&G tail tidy (TT) on it and part of the TT is a small dual LED light which is sodding bright considering its size.

I got an advisory in Sept 2013 as water ingress meant it didn't work more often than it did work. I bought another one which was not too badly priced. I know that technically dosn't answer your question but if i had to place a percentage on the time it was off vs on it would be 80/20 and it still passed with only an advisory. This was at an official Yamaha dealer too.