Fluro lights flicker at a rate [I think] of 60 cycles per second. If you have rotating machinery in your workshop ie lathe, rotating blades etc and they happen to be rotating at around the same rate as your fluro is flickering, it gives the appearance that the rotating object is stationery - you can guess what can happen from here. There are many reported cases of people putting hands onto 'stationery' objects with grim results.
This will occur only if the flicker rate is equal to rpm of the rotating machinery ie 3000rpm. Whilst it can happen on single flouros it is not a common occurrence . After 30yrs in the business I it find to be the rare exception if it occurs