LED panels are one of the most used light sources in spaces like offices, schools or libraries. Panels give a broad, spread light which is influenceable by a few factors. The color of the light is one of the most important feateres. Choosing a cool white light will keep humans concentrated and productive. The URG indicates the glare ratio, which in some cases has to be below 19. The Lumen output indicates how much light is emitted by a light source. An extra high lumen is needed in large areas with low natural light or high ceilings. LED panels have a long lifetime and low energy consumption. Because of this, LED panels are often placed instead of fixtures that use fluorescent tubes. Due to the accomplished energy saving after installation, installing LED panels is a profitable long-term investment.