I love UV lights, and have had every available type including 400W discharge cannons, fluorescent tubes, and LED units. I've previously been slightly disappointed with the effect of other LED-based UV lights because the wavelength was slightly different and they produced a lot of visible purple light. However, these are much better. They do give the authentic UV glow without excessive visible purple light. They're surprisingly powerful and really give a good glow over even quite a large dance floor. They're also nice and light, good value, and have great adjustable brackets on the back. Recommended.