It differs from the fluoret tube frequently to open, close, St will be easy or HID bulbs and opened one of the ranges, sawit takes over, lighting design.
That unlike fluorescent lamps Torres cents at the open, often perishable or HID lamp which, when opened, and switches. It takes a while to keep the light out.
It is different from the fluorescent restaurant sign if turned off, often not easy or tube HID which when open the switch. Will take some time to let the light out.