This superb LED tube light is founded on cutting-edge technology which is super-efficient compared with conventional lighting systems. The appearance of the tube and the quality of the light emitted are similar to the fluorescent tube which it's designed to replace but the electricity consumption is halved. Moreover, there is no delay when the light is switched on and no flicker during operation. Retrofitting the tube to an existing fitting involves some simple wiring modifications and this should be carried out by an electrician familiar with these fittings. The modified fitting cannot be used with conventional fluorescent tubes but you're unlikely to want to use these after trying this new technology!