You are going to love the OSRAM 4W HNS UltraViolet lamp. This product features effective and environmental-friendly disinfection without chemicals. It has a low mercury content and long lifetime due to specific coating and is also ozone free. We love its efficency of disinfecting air, water and surfaces. It has a dominant wavelenth of 254nm (OFR version). It has a long average lifetime of 6000 hours thanks to special coating. Why not choose a trusted product from a tried and tested brand? We know you will love the product as much as we do.