Our products are electronic devices by nature, so when they flash or strobe methodically, they are trying to tell you something. Our tubes will do this when there is an incompatibility somewhere in the application.
In 99% of cases, the tube is trying to communicate a ballast incompatibility. Please remove the ballast from the fixture and wire the tubes to direct power. Most of our customers report an immediate improvement in both performance and energy savings once the ballast is removed! Don't worry - all of our tubes can be wired directly to power without the use of a ballast.