I apologize if the question is posed in a wrong forum. I've had a lamp similar to this one: http://upload.wikimedia.org/wikipedia/commons/4/42/Fluorescent_Lamp.jpg for about 2 years now. Ever since I bought it, when I turn the light off, every 30 to 50 s it emits flashes of light. One flash every 40 s approximately. It does this for more than 30 minutes after I turn off the light. I should mention that its color is white (though I notice it's a very bit blue). This phenomenon doesn't occur with my other similar lamp which is more yellow. I wanted to know what's going on. Thanks in advance.