PROTECH UVPRODon't forget the 'UV' when selecting your next UV light.Ultra Violet (UV) dye additives are specially formulated to fluoresce in the presence of UV light rays. Hence the common industry names for the two major components used with this technology, 'UV' dye and 'UV' lights. Referring to the light spectrum chart below you can see that true 'UV' light is invisible to the human eye, with the closest visible light colors being purple and blue respectively. The overall intensity of UV light diminishes as you move from the invisible UV light range to purple, then to blue and so on down the chart. Take care not to confuse a lamp that emits high intensity visible blue light as superior to a lamp tuned more efficiently to emit true UV light.