Information

Ultraviolet light

Ultraviolet (UV for short) is electromagnetic radiation just outside the part of the spectrum that is visible to the human eye. The wavelength of ultraviolet radiation is between 100 and 400 nanometers, so seen from visible light beyond the violet, hence the name.

UV-A light

We have UV-A light in abundance from the sun on earth. It is hardly stopped by the atmosphere and passes through glass without any problems.

UV-B light

We also have UV-B light on Earth, but most of it is blocked by the atmosphere and it hardly passes through glass.

UV-C light

UV-C does not pass through the atmosphere and does not reach the Earth’s surface.

UV light is only partially visible to our eyes. This part is in the UV-A range, up to approximately 380nm (nanometer). Below that, UV light is invisible to us.

When using UV LEDs, but also with UV-TL technology, visible light is also released. To make the fluorescence effect as clear as possible, the use of a special filter is necessary. These filters look like black opaque glass filters to our eyes, but they are actually permeable to UV light. In this way, the visible light from the LED (or fluorescent tube) is eliminated and only the invisible UV light is allowed to pass through.