In June 2014, Saled deliverd over 1200 LED PS-T 18 watt lamps to the municipality Zwolle for replacing the SOX-E18. That has worked out so well that they now chose to replace another 1600. This solution is not only durable due to the switching off of the ballast, but also due to the re-use of the existing fixtures. The investment is relatively low and earned back within 4 years with respect to the SOX-E18 with ballast. The warranty on the Saled LED PS-T 18 watt is 5 years.