Narrow band 311nm UV phototherapy lamp is portable and efficient to treat Vitiligo,psoriasis,eczema,etc. 1. 9W Phillips UV lamp, high intensity, long usage ... volume, light weight, convenient for patients to move and take along.4. Unique structure design, suitable for clinical and family use5. Voice prompt ... 9W/01/2P (narrow-spectrum UVB) Narrow band 311nm UV phototherapy lamp for Psoriasis,vitiligo