An LED UVA bulb is an LED bulb that will emit a purplish glow to produce UVA light. Since Ultraviolet light has wavelengths shorter than visible light, the beam will be invisible to the naked eye. To understand what a UVA bulb can do for you and what you can use it for it is important to take a deeper look to see what it is and how you can use it for your own benefit. What is UVA light? A UV light is divided into 3 categories UVA, UVB & UVC. UVA has the longest wavelength of these three bands. The wavelength of UVA ranges from 320nm-400nm. This makes it safer than UVB or UVC who have shorter wavelengths meaning they have more energy. Is UVA the same as black light? UVA is also known as Black Light. Black light is used for various types of lighting effects, tanning beds or even for medical reasons to treat fungal or bacterial infections. Why is a black light called a black light? Black lights are lamps that emit ultraviolet light. Due to the fact that ultraviolet light is invisible to the human eyes, the light is considered black as your eyes are concerned. Fortunately, most black lights do emit some kind of violet light so you can avoid over-exposure. What Are the Uses For UVA Bulbs? UVA bulbs have a great number of uses..