If you know how to cut one of the two power leads to a glowing lamp in any fitting and put a fluorescent starter between the exposed ends without burning the house down, or yourself in hospital, you've made yourself a very cheap and very basic strobelight. If you managed to keep the on/of switch attached, then you can switch it on or off, but that's all the control you have over the device. You could forget about the cutting and fluorescent starter and flick the on/of switch repeatedly in quick succession. Even easier, cheaper and the rate of the flashes is controlleable. (Though somewhat limited to your physical condition.) Levels involved ? For the second solution near to zero. For the first I'd like to have an answer to the question lemonie asked.