UV light professionals recommend customized UV flashlight for fly tying.
A 365nm wavelength UV flashlight is, in most cases, the best option,optimally suited for UV resin curing. The 395-405nm UV LED lights thatare now commonly used do not provide as much light in the wavelengthsthat best activate the resin. The Gulff 365nm wavelength LED producesa spectrum of light that best matches the absorption spectrum of thephotoinitiator that is in most UV-curable resins. The Gulff flashlight’sUV light appears whiter than the light of 395nm lights. This is becausethe human eye cannot discern UV light when the wavelength is clearlybelow 400nm. In this case, the light only becomes visible when it strikesa surface that reflects UV light. Experts do not recommend using inexpensivelights with uncertain wattage for resin curing. Their wattages and advertisedwavelengths can vary considerably. Note that, for example, the advertisedwattage in inexpensive versions is often only the maximum possible wattage.There are a number of things that affect the ability to reach this maximum,from the LED to the structure of the flashlight (or other light source) used.