Ultraviolet radiation is divided into three regions: UV-A: 315-400 nanometers (nm), UV-B: 280-315 nm, and UV-C: 100-280 nm. The entolights emit wavelengths of 365 and 395 nanometers and therefore fall in the UV-A spectrum. Exposure to these wavelengths is well within the safe limits, and much lower than UV-A exposure outside in the daytime. We recommend the same precautions you would use when being outside in the daytime: do not stare directly at the lights and/or use UV-A filtering eyeglasses or goggles.