Black light refers to ultraviolet (UV) light that is not visible to the human eye. It emits ultraviolet radiation with a wavelength range typically between 315 to 400 nanometers (nm), which falls beyond the violet end of the visible light spectrum.
Blue light, on the other hand, refers to a specific region of the visible light spectrum that has a shorter wavelength and higher energy compared to other colors. Blue light has a wavelength range between approximately 400 to 500 nm.
Black light and blue light are distinct in terms of their wavelength and energy. Black light is in the UV range and is invisible to humans, while blue light is within the visible light spectrum and is visible.
It's worth noting that exposure to excessive blue light, particularly from electronic devices like smartphones, tablets, and computer screens, has raised concerns regarding potential effects on eye health and sleep patterns. However, blue light from natural sources like sunlight is important for regulating our circadian rhythm and has beneficial effects on our well-being.