When they say specifically to use a 365 nm black light that is pretty specific and that is the type of light used in a lot of code type inspections. I have a $600 Labino brand flashlight which I know is kind of extreme but it puts out 365 nm and besides I like my flashlight....If it was this light, it's not going to work. You need one with a 365nm wavelength. Black lights are 395+