For the distinct reason that LED nail dryers offer a faster drying time compared to UV lights, they are said to be safer than UV lights. A faster curing time equals less time one is exposed to harmful radiation, so this is a definite advantage for clients. It takes UV lights anywhere from 8-10 minutes to cure gels, while LED lamps take 30-45 seconds.
Second, LED bulbs last much longer than UV bulbs. Typically, UV bulbs must be changed after about 10,000 hours of use. If they are not, they could impede the overall quality of your gel manicure. Additionally, if broken they could emit harmful mercury vapors.
LED bulbs however, last for up to 50,000 hours and they use less electricity. Many salons and techs do not know when to change the bulbs, and since they're not changing them, they're causing bad output and subsequently bad curing jobs, which results in a duller finish and faster chips.
Although LED lights are more expensive than UV lamps, you will get a safer and more economical product by choosing an LED lamp in the long run.