Ultraviolet and blacklight are the same in terms of what they do. UV rays and blacklight rays are both UV rays lights. UV rays are shorter than visible light rays. It is the shorter wavelength in UV rays that makes the rays in UV rays more dangerous to our eyes than visible light rays. UV rays and blacklight rays are invisible to our eyes, just like radio waves. We can only feel the effect of UV rays and blacklight rays when they hit the receptors in our eyes. Any device that emits UV rays and blacklight rays is both called a UV lamp. There are also some differences between UV rays and blacklight rays. Blacklight rays are stronger than UV rays because blacklight rays have longer wavelengths. For example, UV rays have a wavelength range of 10 nanometers, while blacklight rays have a wavelength range of 100 nanometers. UV rays have a much smaller wavelength than blacklight rays. Blacklight rays have a wavelength of 100 nanometers or less. However, the difference between UV rays and blacklight rays is often not obvious to the human eyes.