Perhaps some clarification of the symptom is in order. Among those who work with lighting and power, there is often a subtle difference between the terms "flickering", "blinking", "flashing" and probably some more semi-synonyms I've forgotten. Each suggests a somewhat different cause. It's subjective, so explaining that difference isn't straight-forward. I'd say a "flicker" is abrupt and irregular and is often short-lived, likely the result of a loose wire connection or a corroded relay contact. Blinking is generally more regular, repeating slowly but steadily. That suggests an electrical or electronic control problem with the circuit, or the light device itself. Flourescents, though, can show a high frequency blink or pulsing that, paradoxically, is usually called a flicker. Typically caused by a faulty ballast.
