LED LQ-L light source is characterised by high lumen flux and high efficacy. LED LQ-L is not convenient as a direct surrogate for classical fluorescent tubes and is not convenient for fluorescent fixtures that are equipped with magnetic ballasts or electronic ballasts. Voltage is to be connected on both ends of the LED tube on any pin chosen. Pins on each side are internally connected together. LED LQ-L is equipped with rotary sockets for better placement in the light fixture.