Use the HNS L 55 W 2G11 for professional surface, air and water sterilization. This bulb is an environmentally friendly way of sterilization, completely without chemicals. It does, however, contain small amounts of mercury. The UV-C radiation power is 17W. Use this lamp only for disinfection and not in general lighting. UV-C radiation is harmful to the skin and eyes, so consult a specialist when using it.