While you are all bickering over spellink, let me say that a tube right on the edge of going out can be used by simply removing the starter once its been on for a bit. it seems that the tube heat can keep it conducting, but not as efficiently as it should be, indeed lamps working like this can be very strobe like and indeed sometimes you see kind of waves snaking along making parts of the phosphor brighter or darker. I guess its to do with whether the gas inside is being ionised enough to keep the thing alight, the starter system often detects tubes working inefficiently this way ands not yet struck and tries to pulse them with a high voltage but all that does is making go on and off. Change the tube before it wears out the starter! I'm assuming here this is your bog standard little heater bimetal strip wotsit. Brian