I have never spent $1000 as wisely as I did when I had these installed. They are the singlemost effective lights I have ever owned. I usually run them with the yellow lens covers. When a car starts to try to pull out in front of me, I hit the horn which kicks all the lights up to 100% power and as a rule, they immediately pull back. Also, when I am behind a guardian of the left lane, simply turning up the power on the Ericas causes some to think my bike is an official vehicle and most often they move over. As a rule, I run them between 25-50% to be courteous. I have only had them on for 4 months and they have probably saved me from harm at least 5 times. I know they are pricey, but THEY WORK!
Just my 2 cents worth.