There are four nail dryers: fan, UV, LED and dual-band Mixed LED/UV. • Fans are used for regular gel polish. • UV lamps emit 350-380nm wavelength light to cure UV gel polishes with 350-380nm photo initiators. • LED lamps emit 380-410nm wavelength to cure LED gel polishes with 380-410nm photo initiators. • Dual-band mixed LED/UV lamps emit 350-410nm wavelength light to cure both UV and LED gel polishes. If you use an LED lamp to cure UV gel polish, for example, the curing time will be significantly longer —or the gel might not even cure at all. We always recommend that you check your current or intended gel polish’s specifications and requirements before purchasing a nail lamp.