What does the 365+405nm wavelength written on the nail lamp mean?

365nm+405nm refers to the two main UV light wavelengths emitted by the nail lamp: 365nm: Has strong penetration power, activating the photoinitiators in the gel to speed up curing. 405nm: Is gentle and stable, improving curing uniformity and reducing the sensation of heat. Using these two bands together allows for more efficient and safer curing of base, color, and top coats, and is the mainstream professional wavelength combination on the market today.