Philips (195239) PL-L36W/01 Medical Lamp Philips UVB (/01) lamps have a very narrow waveband emission: between 305 to 315 nm with a peak of 311 nm. This is the most efficacious waveband for the treatment of psoriasis, and is therefore much more focused. What's more, because the overall dosage of this narrowband radiation can be closely controlled, these lamps are suitable for home therapy. The UVB Narrowband (/01) low pressure fluorescent Phototherapy lamps are proven to be the most effective lamps for treatment of skin diseases Can be used for treatment of: Psoriasis and Parapsoriasis Vitiligo Atopic Dermatatitis Mycosis fungiodes Other Skin diseases Prescription Required!!!