1 What is UV (Ultraviolet) Light? UV Light is very short wave light! –U–UVA nm (Nano Meter) –U–UVB nm –U–UVB Narrow Band (313 nm) –U–UVC nm

2 Sources of UV Light The Sun –Shorter wavelengths are blocked by the Earths atmosphere. –UVC is virtually all blocked by the Ozone in our atmosphere. –UVA and UVB are not totally blocked. Low Pressure Mercury Vapor Lamps –Produce UV and White light. –Used in some tanning lamps, –Stadium Lighting –UV Phototherapy –Industrial Applications Specialized Fluorescent Lamps –Virtually all UVA and UVB lamps used in Phototherapy today are Specialized Fluorescent Tubes.`

3 Erythemal Response This red line represents our skins erythemal response (sun burning response) to Ultraviolet light.

4 UVB Broadband (Conventional UVB) The blue line is the typical broadband UVB spectra. Notice that a lot of the BB UVB spectrum overlaps our erythemal response curve and hence causes significant undesired burning.

5 UVB Narrow Band The green line is UVB Narrow Band. Note that very little of its output overlaps with our erythemal response curve and therefore we experience very little burning.

6 UVB Narrow Band (the green line)

Action Spectrum for Psoriasis

זה השקף המשמעותי ביותר מראה כי ע"י שימוש ב- NB UVB, האזור הירוק אנו נמצאים עדיין בקצה התחום היעיל לטיפול ב- P (הגרף הסגול) וכמעט לגמרי מחוץ לתחום ה ERYTHEMA ולכן אין סכנת כוויות ועדיין יש יעילות טיפולית.