We are actively engaged in offering PLL-4 18W LED PLL-4 18Watt, which is Retrofitt product that can replace 4 Pin 36Watt CFL PLL-4 Tubes. The PLL LED Tube Light is efficient in saving 60% to 70% on the electric bill. For commercial places, return on investment is for about 7 to 8 months. Basically, the return on investment depends up on unit charges as well as the hours per day. Order retail or bulk, timely delivery is guaranteed!