The world's first high efficient quasi-CW polymer dye laser is described. An average output power of more than 6 W was achieved in a broad band operation mode, at 25 kHz pulse repetition frequency. A tunability over 555-660 nm wavelength range was demonstrated in a narrow band operation mode with minimum 0.5 W of average output power. A stable operation of the polymer laser for more than 2 hours was observed at output power level of 4 W. The integrated output energy of 30 kJ was obtained from one polymer element that corresponds o 220 million pulses.