S3 365nm flashlight is the highest quality blacklight output available. It brings out the uv light without throwing a lot of unnecessary light around. Lights with longer wavelengths (385nm, 395nm, etc) deteriorate in quality and the painting just won't look as good. This is a powerhouse light! Very little visible light with a good black filter lens. Anything that will fluoresce just shines brilliantly.If you are looking for a powerful 365 nm blacklight you won’t be disappointed by this S3 flashlight.