In an environment where the price of energy continues to rise and environmental constraints are increasingly heavy, making the right choices in terms of lighting is essential to save money and reduce your energy footprint, while enjoying yourself. The arrival of LEDs, with its constant innovations, has brought about a real revival in the world of lighting and decoration. The offer of products is now plethoric and it is now very difficult to make the right choice as the technique and models have evolved. The bulb is no longer only useful, it is now beautiful! In less than 15 years, it has become a real object of decoration essential to the "well being at home", just go to the store shelves to see that the crowd never stops. With this book and its 12 chapters you will learn everything about the LED and its world: its operation, its advantages over other lighting technologies, all the criteria to assess the models that meet your needs and advice for use according to different cases of use (leisure, home or outdoor, business, medical, public ...), tools to measure your savings concretely but also a panorama of actors that they are manufacturers of LED chips or bulbs. Finally, you will also discover what the LED has in store for the next 5 years with all the innovations to come. If the lighting of your spaces is important to you then do not waste a moment and devour this book to make the right choices always in accordance with your tastes and your budget.